... magnet, clip, keychain, aircraft aluminium body, reverse polarity protection circuit, antiskid pattern design and anodized processed made WK21 a good choice flashlight ... : Memory function, Tail disassemble strong magnetPackage Contents: Flashlight Keychain O-ring ClipUsage 1. Place battery: unscrew ... qualified battery. XTAR PCB battery recommended. When flashlight is not in use or battery is exhausted, ...