Pixel Oppilas RW-221 2.4GHz 16 Channels Wireless Shutter Release Remote Control for Olympus E series PEN series SP series Use FSK system and world wide free 2.4GHz frequency, more reliable performance. 16 channels available. Support Single, Continuous, BULB and Delay shooting. The remote control distance can reach up to 100m in open area. Support controlling Multi cameras for shooting simultaneously. Powered by 4 AAA batteries. (2 batteries for transmitter and 2 batteries for receiver) Comes with a connection cable.