MINCHEN 800 Lumens XM-L T6 LED Diving Lamp 3 Modes Super Bright Underwater Diving Headlamp Light with 1x 18650 Rechargeable Battery and charger Super Bright Underwater Diving Headlamp, Use CREE XML T6 LED Chip, Long service life,Intelligent circuit control, One switch control 3 modes:High,Low,Strobe and ON/OFF Output brightness can come to max 800 lumens. Under waterup to 50M Needs 1pc 18650 3.7v battery(included), Please load 18650 battery according to "+""-"rightly,then screw positive cap and Negative Cap tightly. The diving headlamp comes with 1pc 18650 battery and a Univerdal Single Slot charger.