Alzo Wireless Radio Shutter Release 300-feet range for CANON EOS Cameras For CANON EOS SLR 1D & Mark II (N), 1Ds, 1Ds Mark II, 5D, 10D, 20D, D30, 30D, D60, D2000 300ft range with penetration through walls (walls will reduce range) Supports Partial Shutter/AF & AE, Continuous Drive and BULB mode Selection of 1 of 16 channels to reduce possible RF interference BATTERIES INCLUDED (life of about 20,000 actions)