how to install batteries? On the bottom is a hatch door thing with an arrow...I cannot get it off...and batteries are included with mine

There is an arrow on the lid. Push horizontally in the direction of the arrow. It will move just a little, then gently lift the lid up from the edge near the end of the arrow. The lid has a hinge on the opposite end so the lid will not come off completely. Battery orientation is confusing as well as there are no molded in -/+ signs. The aaa battery near the cover hinge should have the + end facing the cover. The battery above this should have the - on top. Hope this helps.

is the default F or C?

The default of Hetaida No Contact Infrared Thermometer is ℉, it is FDA approved. And thermometer can be switched easily between ℉ and ℃.

On amazon, i see a lot of forehead thermometers of the same 8813c, are these genuine? which brand is better?

I am not sure. I just bought this on and it is good. none are as accurate as an oral. Be sure to put lithium batteries in it or it will not work.

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Digital Thermometer for Adults and Kids, No Touch Forehead Thermometer for Baby, 2 in 1 Body Surface Mode Infrared Thermometer with Fever Alarm and Instant Accuracy Readings

Digital Thermometer for Adults and Kids, No Touch Forehead Thermometer for Baby, 2 in 1 Body Surface Mode Infrared Thermometer with Fever Alarm and Instant Accuracy Readings

Product ID: 233290703

Details

Age Range (Description)
Kid; Adult
Brand
hetaida
Color
Purple
Connectivity Technology
Infrared
Display Type
Digital
Included Components
Digital

📏2-3.15 inch no-touch range

⏱️1-second instant reading

🌡️±0.2°C accuracy

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Description

🌡️ Stay ahead of the curve with instant, no-touch precision!

SAFE HYGIENIC - Non-contact measurement prevents cross-contamination, keeping your family and workspace germ-free.
PRECISION AT A GLANCE - Advanced infrared sensor delivers ultra-accurate temperature readings within ±0.2°C, ensuring you never miss a fever.
SPEED THAT SAVES TIME - Get instant results in just 1 second—perfect for busy parents and professionals on the go.
SMART ALERTS DISPLAY - Color-coded LCD backlight and fever alarm provide immediate visual and audio warnings for peace of mind.
VERSATILE 2 IN 1 FUNCTIONALITY - Switch effortlessly between body and surface modes to measure temperatures of people, objects, liquids, and rooms.

This FDA-approved digital infrared thermometer offers ultra-fast, non-contact temperature readings with ±0.2°C accuracy. Featuring a 2-in-1 body and surface mode, a color-changing LCD display, and an audible fever alarm, it’s designed for all ages—from babies to adults. Compact and hygienic, it delivers reliable results in just 1 second, making it an essential tool for families, schools, and professionals seeking quick, safe, and versatile temperature monitoring.

Specifications

ASIN	B08HWBWD4S
Additional Features	Alarm
Age Range (Description)	Kid; Adult
Age Range Description	Kid; Adult
Best Sellers Rank	#2,017 in Baby ( See Top 100 in Baby ) #13 in Baby Thermometers
Brand	hetaida
Brand Name	hetaida
Color	Purple
Connectivity Technology	Infrared
Customer Reviews	4.6 out of 5 stars 7,870 Reviews
Display Type	Digital
Included Components	Digital Thermometer
Indoor Outdoor Usage	Indoor
Item Length	5.34 Inches
LowerTemperature Range	93 Degrees Fahrenheit
Manufacturer	htd
Model	HTD8813C
Model Name	HTD8813
Number of Batteries	2 AAA batteries required. (included)
Outer Material	Plastic
Part Number	HTD8813
Power Source	Battery Powered
Product Care Instructions	Wipe Clean
Resolution	8K
Response Time	1 seconds
Reusability	Reusable
Smart Home Compatibility	Not Smart Home Compatible
Special Feature	Alarm
Specification Met	FDA
Style Name	Contemporary
UPC	193674503271
Unit Count	1.0 Count
Upper Temperature Range	109 Degrees Fahrenheit
Warranty Description	1 Year

Reviews

D**D

2.03.2026

L**S

30.04.2026

J**I

2.04.2026

K**.

30.01.2025

F**I

1.05.2026

M**E

29.04.2026

A**R

9.12.2025

M**R

28.04.2026

C**A

6.06.2025

R**N

13.05.2024

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.

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