MagicShine SEEMEE 300/400 Bike Taillight,300/400 Lumen Bike Tail Light,360° Visible Smart Brake Sensor IPX6 Waterproof Rear Bike Light for Night Riding

Very easy to mount onto my seat post, very bright and visible even at the lowest setting, and the mixture of static and flashing lights gives me assurance that I'll be seen at night. I usually just keep the light on the low setting with a slow flash, that's more than enough for me. Battery life is very good as well, but I only ever use it for 10 minute stretches so if you use it longer naturally it'll need charging more often. Short rides and you should be fine to not worry about it for over a month. Recommend, worth the price.

I bought the SeeMee 300 a few years back and liked it enough that when it was time to replace it, I went with the SeeMee 400. Glad I did. This newer one is even better than the old one. It’s brighter, seems to last longer, and has a lot of useful flash and brightness settings. For around the price, I honestly don’t think you can beat it. It gets attention in daylight and is plenty bright at night too. Easy to mount and easy to use without messing with it every ride. This is my second light from them so, If you need a tail light with a lot of features, this one is worth considering.

Excellent light that spent all winter in MN with me - commutes are dark both ways. I bought this after entirely too much research into tail lights, and this one won out for two primary reasons: 1. The listed battery life on this unit is way longer than most tail lights on the market, and I can confirm from use that it does last a long time - weeks between charges with simple commute usage. 2. The downward-facing tracing LED is a brilliant idea that provides both identification and positioning information to drivers when sharing a road. I can’t say I’ve driven past myself, but I certainly feel more comfortable knowing my legs are lit up as they pass. The only feature I wish this had is whatever the syncing tech is to control the tail along with the headlight. I also use the Hori headlight from the same company, and their smaller tail lights without the tracer LED sync up with the remote control. Maybe on the next version. Highly recommend this piece of kit!

SEEMEE 300 REAR LIGHT. REVIEW. Good working item. Visible in darkness and daylight. Easy mounting and charging. You can remove it and travel with it on your person while parked then reattach when ready to go. Charge lasts about 8 -10 days depending on time riding. I commute daily. I use the flashing light settings. This light increases your visibility from behind. People notice me on my bike better especially when coming up behind. A very useful device indeed. Thanks SEEMEE 300.

Update 01 DEC 2025: Much to my surprise, Magicshine reached out and offered my money back. Well, the light “works” but I had to create a custom mount. Instead, I asked for another light as I need another bright tail light. Now I have two and am building another custom bracket. The light is that good, I don’t mind spending time making it work. It’s your call. If you have to mount the light anywhere other than the seatpost, you will have to get creative (added photos for reference). See my original review below for details. I’m adding a star back due to customer support. Oh, Magicshine claims to be working on better mounts, and I believe them after seeing their new Hori 1300 light with a Garmin mount. Hope this helps. ————————————————————— First, the good: Brightest tail light I own, and I’ve owned many. Great side and rear visibility day and night. Great battery life. Near perfect design. The bad: The mount really ruins this fabulous light. Why? Because it only mounts to the bike seat or seat post, and it does so in a flimsy, non-standard way. In other words you cannot mount this light on a rack or vertical bike part…Only angled seat tubes. Who on Earth made this design choice? Every other light I own easily adjusts to anything, allowing mounting to a rack, pack, rear triangle, seat post, helmet, etc. The good lights feature adjustments to aim the light so cars can see it. With a non-adjustable angle built into the mount, the light either angles up towards the sky or down to the road if mounted on anything other than the seat post. No amount of brightness makes up for a misaligned light. Worse yet, if you ride with a trunk bag, you can’t use a seat light because your bag blocks the light. Magicshine gives you zero options for any other mounting options, so you either get creative or return the light. Also, all my other lights have a secure quick release design that is trustworthy. This quick mount just doesn’t inspire confidence. Why not use a standard Garmin or Planet Bike Superflash mounting design??? Ugh. Magic shine, you were so close to perfection…but the mount is such a weak point. Me? I had to make a custom mount with glue and plastic since there is zero vertical adjustability. I shouldn’t have to engineer a solution because Magicshine’s designers couldn’t get it right. The light is too expensive to justify such a brain-dead, inflexible mount. It’s your call. If you ride with just spandex on your bike, this light will work on your seat post. Anything else may block or mis-aim the light, and no amount of lumens can correct for this. Light = perfection Mount = disaster

I bought this brand because of positive reviews, and I use their headlight on my ebike. The battery life has been good so far. I leave prior to sun rise, and mostly use this for "nighttime" illumination. The light that illuminates the bottom is really nice addition. It comes with two mounts. One for the seat post, one that I was able to attach to the seat bracket or the rear rack.

Great light if not the best, it has everything in tiny small package. The battery life is med, so you have to charge it before each ride also it depends on what settings you have it on. You will not be disappointed by this one. Mounting is great. I mounted it to the seat post. It’s very bright, it has sensors it can be synchronized with headlight like hori1300s which I did and I switche them both on and off from the switch button that came with hori1300s, both of these lights are the best combo you ever need

Really cool light. The smart-brake mode works great, just apply your brakes and the light illuminates to brightest setting. The quality is great. I feel confident riding with this light at night. The modes are not exactly intuitive but for the money and features I can get over it.

視認性が良くてとても気に入ってます。

Really bright! wow it's the brightest rear light i have ever seen even when compared to my varia. Basic operation is straightforward on off and cycling of modes with the same button. I like the variety of modes from flashers to solid lights and even a down facing flasher is great to get more attention. Pairing with my Magicshine Hori and remote was okay but a bit confusing following the instructions. It is all paired up and toggling the remote or front light turns on the rear. pretty nice. However, i am still a bit confused if it is a mistake on my part or a setting i missed that i unable to toggle modes with the remote and the two paired up something i will need to figure out. Pairing to the Magicshine android app sorta works. I am able to connect to the device but it crashes so i will probably need to wait for a few updates to the app as this is a brand new device. The app is nice to configure custom modes and perhaps what i am looking for to address the buttons on the remote not toggling anything when they are both paired. Finally i just had no luck pairing with my Garmin Fenix 6 via ANT+ but i will try other bike computers as well. Not something i will use as i am sticking to the remote and FTR function for lighting sync. Mounting is fantastic with the twist lock style mini connector. There is a seat post mount included that is easy to use. But i really like the under seat mount, snaps on to the seat rails tight and secure and easy to zip tie for security with the included zip ties. It's a great little light at 79g it packs one heck of a bright rear light to get noticed. Integration with the other Magicshine products works but could use a little bit of updates to make them even smoother and functional. If you aren't going with a radar this is an absolutely fantastic option

This light has some very opinionated design decisions in the software, and to the product folks out there....if you're gonna be opinionated in your design, you're gonna get opinionated reviews. Buckle up, 'cause it's gonna get a little rough. The tl;dr: Excellent hardware that forces high power consumption on you, whether you want it or not, so that instead of up to 11hrs of battery life, you get 2-3 when riding in darkness. (And yes, this is a problem - I don't want to have to charge the battery every single day.) On the plus side: USB-C charging, excellent battery capacity; good battery life* in the mode I use most frequently; many modes; mode memory; quarter-twist mount. Now for that asterisk on the "good battery life": What I want out of a bike taillight is something that flashes stupid-bright so that the doofus in the car coming up behind me looking at their phone has something catch the corner of their eye and get their attention. And this does have an excellent daytime-bright flash mode. All good so far. The problem, though, is that once it starts to get even the slightest bit dark outside, it switches to this mode where it pulse-glows out the back and shines a bright red light directly to the pavement. At no time in my life have I worried about being hit by a car coming at me from below the surface of the pavement. I get that "provide visibility from the side" thing, but guess what - you extend the lens around the side of the housing a centimetre or so and that 300lm flash (that you turned off in favour of some slowly pulsing glow) gets people's attention. "But it's too bright at night", you say? Impossible. Nothing is "too bright" for a bike to get noticed, particularly when it's red. Goal #1 through #20 is "get noticed". So, not only does the light go from a bright flashing "HERE I AM!!!" flash to a dull slowly pulsing light is that there's now TWO LED'S soaking up battery power, so the runtime of the light goes from 11hrs to maybe 3hrs at best. Yay (insert sarcasm emoji here). And if/when the battery does run low, instead of doing what it can to extend that runtime by....you know,....GOING TO THE FLASH MODE THAT LASTS FOR 11 HOURS, it instead glows even brighter so that you notice that your light is running low. Which....ok, great -- the light let you know. But what can you do about it for the remaining hour of riding until you get home...? Nothing. Just accept the fact that your light is gonna go out sooner than necessary. And then it has a brake light function: In theory, you hit the brakes on your bike, and the light shines brighter. There's no wire/sensor like there is on a car, of course, so it has to rely on some electronic sensor. So, I realize this isn't easy. But come on: If you're riding at like 35kph on flat road, peddling at 90rpm or whatever, if your speed varies between 35.8 and 35.5....the brake light should not come on. And yet it does - again just absolutely KILLING the battery life. The best part of all of these "features" is that MagicShine makes absolutely none of it configurable. If you WANT to just keep the low-power super-bright flasher going once it gets dark (and by "dark", I mean roughly half an hour before sunset on a clear day - why?!), instead of the light switching to the highest power consumption mode, well, go buy another light. Because this one won't let you. So I did. In short, this is a great light with TERRIBLE software.

Gran luz trasera.

Used this for the first time a few days ago and it worked well. However after my ride yesterday in heavy fog and a bit of rain it has completely stopped working. Can't say if it was weather related or something else. It's supposed to be water resistant and certainly should be useable in wet weather. What a waste of money.