Dual-purpose LED Wristband Light includes the following features : 

• 4 x 2835 White LED and 2 x 2835 red LED
• 4 Lighting modes (white light 100% > white light 15% > red light > red light strobe)
• Powered by built-in lithium battery (included)
• Attached with an adjustable strap that can be used as wristband and bike tail light

Material :

• ABS body
• Nylon strap

Size closed :

• Light part - Diameter of 3.8 cm x Thickness of 2.5 cm