What's in the box:

1 X Intelligent LED Bicycle Tail Light USB Chargeable Bike Rear Lights Brake Sensing Safety Warning Cycling Light (Standard), Standard

When it senses the brakes. It will enter highlight mode for 3 seconds. In intelligent mode. It will automatically turn off the light when you stand still for more than 1 minute. Automatically turns off lights in well-lit environments.

Features:
Accurate brake induction. Prevents triggering of brakes due to bumps.
High strength aluminium alloy material.
Automatically turn on/off depending on the light intensity and motion.
Automatically switch to sleep mode to save power.
IPx6 Waterproof.
Easy to install, no tools required.
500m irradiation length, 220 degrees wide angle.

Specifications:
Fixed mode: saddle fixed
Item color: black
Material: aluminium alloy, ABS, PC
Waterproof: IPX6
Brightness: max. 60lm
Battery: 3.7V, 350mAh
Item size: 51 * 33mm / 2.0 * 1.3in
Package size: 95 * 70 * 45mm / 3.7 * 2.8 * 1.8in
Package weight: 75g / 2.6ounce

Packing List:
1 * Bicycle Tail Light