CatEye: HL-EL160 Waterproof IPX7: Operates even after 30 minutes of submersion in a depth of 1 meter Long runtime 3x brighter than EL135 Light mode memory Battery: AA alkaline battery x 2pcs Weight: 83 g Mount size: 22 - 35 mm ORB Simple, compact and lightweight Easy switch operation - lens acts as power & mode button Side visibility Versatile heavy duty rubber strap mount Attaches to seatpost, helmet or bag with the heavy duty rubber band CR2032 battery x2 3 modes Weight: 26g