Don't let yourself be stuck without a functioning unit because you didn't bring extra batteries to power your device thanks to the ATN 16,000 mAh Extended Life Battery Kit. This battery kit can support your binoculars or monoculars for up to 15 hours. You can use your devices longer and save money, as well as the environment in the process. Enjoy your outdoor activities all day long, whether scouting, camping, bird watching, hunting, or surveillance. You can even power your non-ATN devices that are compatible with a micro USB. The 16,000 mAh Extended Life Battery Kit includes a USB to Micro USB with L-shape connector, ATN cap, and a butt stock case.