Fenix BT20 750 lumens Dual Distance Beam Cree LED 5 Mode Bike Bicycle Light with Fenix ARE-C1 Battery Charger, 2 X Fenix ARB-L2 18650 rechargeable batteries and 4 X EdisonBright CR123 Batteries bundle Dual Distance Beam system with Max 750 lumens Wide compatibility; Aerodynamic user-friendly design. Intelligent power indicator ; Helmet Mount Included Water resistance to IPX-6 standard; Operates on two 18650 or four CR123A batteries