Specification:
4 channels with hot shoe connector for external flashes
Transmitter Power: 23A 12V battery
Receiver Power: 110-220V AC power

Maximum Working Distance: 30m (open area， without interference)
Operates on Frequency: 433MHz
Highest responding time up to 1/320s
Standby time: one year
Triggering life: up to 20，000 times

Package included:
1 x Transmitter (with 23A 12V battery installed)
2 x Receivers