Demo video of equivalent product

Hoyou Sports 5-LED Laser Bicycle Tail Light 

Design For Your Safe Riding In Mind, High Quality & Brightness Warning Tail Light

• Constant mode runs to about 9 hours
• 5x RED LEDs, 3-mode
• 2 Red Laser beams, 2-mode
• Waterproof design
• Quick release clamp fits 25mm - 32mm seat post
• AAA batteries( included)

Package Content:
1 x Bicycle light laser 
1 X Clamp
2 X AAA Batteries (included) 
2 X Rubber Gasket
1 X Retail Package