Specifications: Type: LED Mode: 4 modes Brightness: 15 lumens Item Color: Black LED Light: Red, Blue, White Fittings Color: Random Suitable Tube Diameter: 12-32mm/0.47-1.26" Mounting Placement: bicycle seat post Product Weight: 60g Product Size: 7.5 x 3 x 2cm/2.95 x 1.18 x 0.79" Package Weight: 100g Running time: Long bright: 4 Hours Slow flash: 10 Hours Shun flash: 12 Hours Strobe: 8 Hours Charging time: about 2 Hours