USB RECHARGEABLE BATTERY: Rechargeable Energizer Lithium Ion Battery (cable included). MULTIPLE LIGHT MODES: Fast Flash | Slow Flash | Constant On HIGHLY VISIBLE REFLECTIVE STITCHING: We added even more visibility with our reflective stitching. USE TIME: 8+ hours of continuous use depending on mode of use. 60+ days on stand by INNOVATIVE LEASH ATTACHMENT: Metal D-Ring for leash attachment WIDE FIBER OPTIC: Provides maximum light transmission. QUICK CONNECT BUCKLE: Easy on, easy off. ADJUSTABLE SIZE: See sizing below to get the correct size for your dog. INTELLIGENT CHARGING: Quick charge, with indicator light.