Premium Power Pack: Olight OMNI-DOK Universal Chager With Two Olight 3400mAh 18650 Batteries and Bright Lumentac Keychain Light Superior cycle life performance - High capacity 3400mAh 18650 Rechaeable Battery you can recharge 500 cycles without deteriorating performancerg Fully automated - it identifies battery types and apply appropriate charging mode, then stops charging when it completes. It even displays charging progress at 25% increments. Built-in protective circuits - overcharge, undercharge, over discharge protection. power indicator blinks and charging will not begin if attempting to charge unsupported batteries or batteries are not correctly installed. Supported Battery Types: Li-ion: 18650, 17670, 16340 (RCR123), 14500; Ni-MH/Ni-CD: AA, AAA Include Olight OMNI-DOK Charger, 2x Olight 3400mAh 18650 rechargeable batteries and a bright Lumentac Keychain Light