Keep your power source safe and toasty in these waterproof 3xAA battery holders. They're just like classic switched battery holders, but designed for survival! The case has a rubber gasket around the edge of the case (its black and hard to see in the photos but it is there) and attaches together with 4 machine screws. What we like about this design is that the hexnuts are captive in one side and you can assemble/disassemble as many times as you need. There's a potted power switch and a rubber-boot on-off switch (press to turn on/off). Use with any alkaline or rechargeable batteries for about 4.5V output.