Aputure TXII-SET Trigmaster Plus II (Black) Trigmaster Plus II (TP2) is a transmitter and receiver system built into one pocket-sized unit 2.4G wireless Radio Signal with Interlink Triggering Mode; Trigger your Camera and Flash at the same Time, without Suffering Interference Long shooting Life; 2 AA batteries, Standby Power is 200 hours, and 80 hours while in use High Voltage Flash Compatible; works with high voltage flashes up to 300v Also features; Zone Control, Relay Mode (RL), a Range of 500 meters, 6 Channels, and more