Product description Extended Life Battery kit - Provides 10,000mAh of power to operate your ATN Smart Device, instead of basic AA batteries USB to micro USB w/L shape Connector - is designed to be used with our ATN Smart Devices Neck Strap with Battery Holder - is used as a holder and protective cover for the battery 15 hours of continuous use - allows you to use all features of the device without worrying about changing batteries. Easy to recharge and can power other devices Don't let yourself be stuck without a functioning unit, because you didn't bring extra batteries to power your device. ATN Extended Life Battery kit can support your binoculars or monoculars for up to 15 hrs. You can use your devices longer and save money and the environment in the process. Enjoy your activities all day long - whether scouting, camping, bird watching, or surveillance. You can even power your none ATN devices, which are compatible with a micro USB. Designed to be used with the ATN line of Smart HD Optics