EPS Battery Packs can be used with such devices as Digisight N550, Recon, Ranger 5x42 and other equipment outfitted with an external power supply jack. The EPS3 has a capacity of 2.4Ah, is equipped with a mount to be affixed to a Weaver rail of a device. The 5Ah EPS5 is supplied with a one meter long extension cable which allows it to be stored in any suitable place, in a pocket, for example. The use of Battery Packs significantly – up to 20 hours - increases self-contained operation of external equipment. Thanks to the supplied connector for devices with car lighter adapter, Battery Packs are suitable to power various external devices like GPS navigator, FM modulator, mini TV set, cell phone etc.