does this tail light have external battery pack ?

No, it comes with a charger for each of the two lights. This is a great product and well made. I had a tail light by another company and it was cheaply made and didn’t hold the charge. I’m much happier with the Asher product.

Does this light act as a reflector when not on?

No it doesn’t. I just road by bike this morning and the bright flasher mode is terrific

Do you make these in amber (yellow)?

Not these. But they do have others that lights up in amber color your looking for.

Does it fit onto a rear rack with an 8 mm diameter?

Should do, fits tightly around our Kayak Straps

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Ascher Bike Tail Lights, 2 Pack USB Rechargeable Bicycle Cycling Rear Light | Bright LED, 4 Light Modes, Long Battery Life, 45° Adjustable Mount, Waterproof, Easy Installation, Safety Bike Light

Product ID: 72548816

Details

Auto Part Position
Rear
Brand
Ascher
Color
Red Black
International Protection Rating
IPX4
Item Weight
0.12 kg
Material
Plastic

💡4 versatile light modes

💧IPX4 water-resistant design

🔋330mAh rechargeable battery

$28.13

Duties & taxes included

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚴‍♂️ Light up your ride, own the road!

DOUBLE THE SAFETY - Two ultra-bright rear lights included—keep one on your bike, one in your bag for instant backup.
EFFORTLESS MOUNTING - One-touch slide-on/off with silicone strap fits most bike frames securely.
TAILORED VISIBILITY - Four dynamic light modes for every riding condition—day or night.
POWER UP RIDE LONGER - Fast USB-C recharge keeps you cycling without downtime.
WEATHERPROOF CONFIDENCE - IPX4 waterproof rating means your safety light performs rain or shine.

The Ascher USB Rechargeable LED Bike Tail Lights 2 Pack features a powerful 330mAh lithium battery with USB-C fast charging, four customizable light modes including steady and flashing options, and an IPX4 waterproof rating for reliable all-weather use. Designed for easy installation with a silicone strap and one-touch mount, these ultra-bright rear lights enhance visibility for cyclists of all levels, making them a top choice for safety and convenience.

Specifications

ASIN	B07FDVSVDX
Auto Part Position	Rear
Best Sellers Rank	#4,807 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #4 in Bike Taillights
Brand Name	Ascher
Color	Red, Black
Customer Reviews	4.6 4.6 out of 5 stars (9,115)
International Protection Rating	IPX4
Item Weight	0.12 kg
Manufacturer	Ascher
Manufacturer Part Number	HJ-045
Material Type	Plastic, Silicone
Model Number	HJ-045
Mounting Type	Seat Mount
Number of Items	2
Number of Packs	2
Number of Pieces	2
Number of settings	4
Power Source	Battery Powered
Unit Count	2 Count
Water Resistance Level	Waterproof

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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$28.13

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Good experience, but the tracking updates could be better.

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I loved the variety of products available. Will definitely shop again.

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