can I drive a small external speaker from the earphone jack?

Yes, if your speaker has aux function and 3.5mm aux cord, you can play it in external speaker. Sincerely, PRUNUS

How is its am fm reception?

Reception is great, like a giraffe, it has a super long antenna.

Will transistor radio still work inside a backpack?

Yes, this radio will play inside your backpack if turned on as you walk around unless you're down inside a bunker, then it may be hard to pick up most stations. The J-166 is a good cheap radio that has good sound.

I searched online. Here is description: DSP (Digital Signal Processing) technology has forever changed the portable receiver market in so many positive ways: It’s made portable radios more affordable for consumers

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PRUNUS ポータブルラジオ AM FM J-166 パパとママへのギフトチューニングライト付き電池式ラジオバッククリップ受信性抜群 AM FMラジオポータブルトランジスタラジオ

PRUNUS ポータブルラジオ AM FM J-166 パパとママへのギフトチューニングライト付き電池式ラジオバッククリップ受信性抜群 AM FMラジオポータブルトランジスタラジオ

Product ID: 724799208

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Details

Brand
PRUNUS
Color
ブラック
Special Feature
乾電池対応
Connectivity Technology
3.5mm Audio
Product Dimensions
6.6L x 3W x cm
Tuner Technology
AM FM

📡360° adjustable 16.5-inch antenna

📻Compact handheld size 2.7×5×1.1 in

🔋Battery indicator for power status

Description

📻 Stay tuned, stay connected — your pocket-sized gateway to the world’s best AM/FM vibes!

EFFORTLESS CONTROL - Simple 3-knob interface with tuning & volume for stress-free listening after a busy day.
SMART BATTERY ALERTS - Red battery and green signal indicators keep you powered and perfectly tuned—never miss a beat.
CRYSTAL CLEAR RECEPTION - Advanced DSP chip + 360° adjustable antenna ensures flawless AM/FM signal even in remote spots.
ULTRA PORTABLE POWERHOUSE - Fits in your pocket, weighs just 4.2 oz—take your favorite stations anywhere.
IMMERSIVE AUDIO EXPERIENCE - Built-in magnetic speaker plus 3.5mm headphone jack for private or shared moments.

The PRUNUS J-166 is a sleek, battery-operated portable AM/FM radio designed for on-the-go professionals and families. With a compact size comparable to an iPhone 7, it features a 360° adjustable 16.5-inch antenna and advanced DSP technology for superior signal reception. Its intuitive 3-knob controls, built-in magnetic speaker, and headphone jack deliver clear sound anywhere. Smart LED indicators for battery and signal status ensure you’re always ready to tune in. Perfect as a thoughtful gift for parents or anyone who values reliable, portable radio entertainment.

Specifications

Display Type	Mechanical
Tuner Technology	AM, FM
Compatible Media	Earphone, Headphone, Laptop, Smartphone
Brand	PRUNUS
Color	ブラック
Included Components	Owner's Manual
Manufacturer	PRUNUS
Material	Plastic
Item model number	J-166
Connectivity Technology	3.5mm Audio
Display Technology	LED
Batteries Included	No
Product Dimensions	6.86 x 2.79 x 12.7 cm; 145.15 g
Product Features	乾電池対応
Item Height	5 inches
Item Width	1.1 inches
Item Length	2.7 inches
Size	Handheld size
Batteries Required	Yes
Included Features	PORTABLE AND BATTERY OPERATED RADIO
Item Weight	0.32 Pounds

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