Features: 4 Channels, anti-interference. Suit for Canon Nikon Sony DSLR camera with single-point hot shoe. With cable connect camera and transmitter, even your camera without hotshoe, you can use the trigger. With 3.5mm to 6.5mm adapter, convenient for your choose. The highest synchronous speed can reach 1250 sec. Maximum Working Distance: 30m (open area, without interference). Specifications: Power: - Transmitter Power: 23A 12V battery - Receiver Power: 110-220V AC Channel: 4 Working Distance: 30m (open area, without interference) Synchronous speed: 1250 sec Package size: 17 * 12 * 3.5cm 6.7 * 4.7 * 1.4in Package weight: 135g 4.75oz Package List: 1 * Transmitter 1 * Receiver 1 * Adapter(3.5mm turn 6.35mm) 1 * Cable(connect camera with transmitter)