Neewer 2.4GHz Wireless Remote Battery Grip Replacement VG-C1EM with Screen Lock Function Works with NP-FW50 Battery for Sony A7 A7S A7R 2.4GHz wireless channel with is adopted FSK signal model can more efficiently guarantee the speed, distance and stability. Vertical shooting shutter release. The timer can set delay time, exposure time, time interval and number of shots. Remotely control the camera shutter from 100 meters away in the open space. All interface block electrodes and signal pins employ pure and thick metal plating technology that provides perfect contact and conductivity, as well as great performance to resist oxidation.