EACHSHOT MK-AR7 Built-in 2.4g Wireless Control Battery Grip for Sony A7 A7r A7s With NP-FW50 Batteries and Charger Package includes two pcs of of NP-FW50 batteries and one pc of charger. Two lithium batteries can be put into the grip, with make it have double power. 2.4GHz wireless channel with is adopted FSK signal model can more efficiently guarantee the speed, distance and stability. Vertical shooting shutter release.