This  LED bike tail light comes with an adjustable connecting buckle for easy DIY installation.  You can install it on universal bikes for safety at night. 
This tail light  features built-in 5 bright LEDs in 7 lighting modes and 2 red laser lights in 2  lighting modes. 
For LED light, you can set it to be steady-on, to flash rapidly  or slowly, to slowly flash from left to right or from right to left, and more  LED light modes wait for you. For red laser light, you can choose from  steady-on mode and flash mode. All these lighting modes are designed to meet  your needs.

Features:

Suits  universal bikes
Comes  with adjustable connecting buckle
Easy  DIY installation
Built-in  7 LEDs and 2 red laser lights
Laser  lights in steady-on, flash modes
LED  light modes of steady-on, rapid flash, slow flash, slow flash from left to  right, slow flash from right to left, rapid flash from left to right,  left-and-right loop flash
Resists  water for everyday use
   
Specifications:

Laser  Light: 685±5nm 2 red laser lights
Laser  Light Modes: steady-on, flash
LED  Light: 5 LEDs
LED  Light Modes: steady-on, rapid flash, slow flash, slow flash from left to right,  slow flash from right to left, rapid flash from left to right, left-and-right  loop flash
Illuminating  Range: 260°
Battery:  2 pcs AAA 900mAh rechargeable Ni-MH battery suggested (not included)
Dimensions:  3.15" x 2.72" x 1.30"(L x W x H) (approx)
Net  Weight: 2.32oz
Package  Size: 2.72" x 4.77" x 1.22"(L x W x H) (approx)
Package  Weight: 2.73oz
Color:  Black+Red
   
Package Contents: 
1 x  LED  Laser Bike Tail Light
1 x Light  Connecting Buckle