Phottix Ares II Wireless Flash Receiver is used in combination with a trigger to wirelessly fire flashes, compacts, and battery pack lighting in any situation. When used with the Phottix transmitter this receiver is capable of firing lights up to 490ft apart. Features: 2.4GHz wireless remote Single pin hot shoe Supports Canon / Nikon / Sony (MIS) / Pentax camera 16 Channel system with 4 Groups (A/B/C/D) 4 digi code (0000-9999 channel 5-16) Channel 1-4 support Strato II Transmitter 3.5m mono phone jack for Studio flash trigger LCD display with green back light (8sec) LED for status. Screw lock hot shoe. Battery Power with 2xAA