Power of transmitter 23A 12V mini batteryincluded about one year lifetime Power of the receiverAC 2 15V AAA Alkaline Batterynot included Outdoor working distance max 30m 90feet open area no fraise Indoor operating distance max 25m 75feet Channel 4 channels Frequency 433Mhz Synchronous speed Max 1250sec Umbrella socket approx 08cm 024in Universal hot shoe interface compatible with Canon Nikon Sigma Olympus Pentax etc Package includes 1 4-channel Transmitter23A 12V battery included 2 4-channel ReceiverAAA batteries NOT included 1 PC Sync Cord25mm to PC 1 User Manual
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