Specifications:
* 4 channels with hot shoe connector for external flashes
* Transmitter Power: 23A 12V battery
* Receiver Power: 2 AA Battery
* Maximum Working Distance: 30m (open area, without interference)
* Operates on Frequency: 433MHz
* Highest responding time up to 1/1000s
* Standby time: one year
* Triggering life: up to 20,000 times