Model: C3 - With umbrella holder - It incorporates the functions of studio flash trigger speedlite trigger and remote shutter - Transmit frequency: 433MHZ - Workable range: within 100m - Channels: 16 - Sync speed: 1/250S - Battery for transmitter: 12V 23A battery (included) - Battery for receiver: 2*AAA battery (not included) - Compatible with: Canon EOS1Ds Mark II / III / 1Ds/1D Mark II / III / IV / 5D/7D/50D/40D/30D/20D/10D/D60/D30/D2000/1V HS/1V/3 - Package included: - 1 * Transmitter - 1 * Receiver - 1 * Remote cable - 1 * Sync cable - 1 * PC cord - 1 * Convert adapter - 1 * English/Chinese user manual