Kingpower K1 uses one common AA batteries. Practical and solid are the main features.
Features . Stainless steel head-solid . 2mm-4mm in housing thickness-solid . Stable circuitry with long life span . Four output levels . Aircraft aluminum housing . Type III hard anodized finish(black) . Able to stand on tail
Kingpower K2 uses two common AA batteries. Practical and solid are the main features.
Features . Crenelated head . 2mm-4mm in housing thickness-solid . Four output levels . Aircraft aluminum housing . Type III hard anodized finish (black) . Able to stand on tail