TerraLux TLF-TDR-2 Tactical USB Rechargeable Flashlight, Black Self Defence capabilities from strobe function and strike bezel Runs on: 2 x CR123 or 1 x 18650 lithium batteries - 1 x 18650 rechargeable battery included Output Mode/Runtime: High: 500 lumens/3.1 hours - Medium: 150 lumens/7.3 hours - Low: 10 lumens/215 hours - Strobe: 500 lumens