Check the listing for details. FMA PVS31 IR Infrared Strobe Helmet Battery Storage Case Box & L Cable AOR1. Condition: New with tags. Listed at 95.87 USD. Can use four AA 5 batteries, voltage 1.2v-1.5V, you can put two sections to use, the total output voltage between 2.5-3.7 (it is recommended not to use rechargeable batteries) and the battery box on both sides (such as the left two for a group, the right for a group) can not be mixed together, can not be installed on one side of the rechargeable batteries, not rechargeable batteries, the output will be unstableThe back of the shell factory equipped with a set of tooth surface, to use with the helmetThe bottom of the shell switch left and right flap to take asymmetric design, convenient for the battery box configuration in the rear of the helmet when the user blind operation useBattery box with IR strobe identification light function of enemy-me identification function, universal infrared strobe battery box can be used as a helmet enemy-me identification light aloneThe universal IR strobe battery pack uses gold-plated flexible contact pins to extend the ultimate enduranceThe battery case is sealed with a waterproof rubber ring at the top to prevent dust and rainThe universal IR strobe battery case uses a special layer of negative springs to extend the battery life.Clearly marked positive pole inside to avoid reverse battery installation Color: aor1 Package include: 1* functional battery case with L wire (not include battery)