Vello FreeWave Viewer VL Wireless Live View Remote Wireless 3.5 Half-Press Function for Focus & Exposure | Wireless Transmitter with Built-In CCTV | 328' Wireless Range at 2.4GHz Frequency Four Radio Channels | 2 Li-ion Rechargeable Batteries Included | Brightness and Contrast Adjustments In The Box: Transmitter, Viewer, Removable Pop-Up Shade, USB Wall Charger, 2 x NP-60 Li-ion Batteries, AV Cable, Wrist Strap, Limited 1-Year Warranty