5 Mode: High, Medium, Low, Strobe, SOS * Comes with 18650 battery and charger * Powered by: 1x 18650 or 3x AAA battery * Dimensions(L x Head Dia. x Body Dia.): 5.31 x 1.37 x 1.10 inch / 3.5 x 3.5 x 2.8 cm * If you need flashlight MOUNT to install on bike, please search B00EP6VWNO