Front Light 2 x Bright LEDsFits all 22.2-31.8mm handlebarsUniversal bracket for horizontal or vertical alignment3 functions - Flash, Pulse, ConstantIPX4 rain proof protectionTool-free fittingRequires 2 x 3V Li CR2032 batteries (included)Brightness: 8 lumens Visibility: 30o Beam Distance: 600m Run Time: 60hrs Flash/Pulse, 30hrs Constant Weight: 21g Rear Light 2 x Bright red LEDsFits all 22.2-31.8mm round seat postsUniversal bracket for horizontal or vertical alignment4 functions - Flash, Pulse1, Pulse2, ConstantIPX4 rain proof protectionTool-free fittingRequires 2 x 3V Li CR2032 batteries (included)Brightness: 4 lumens Visibility: 30o Beam Distance: 600m Run Time: 70hrs Flash/Pulse, 30hrs Constant Weight: 21g