B-Stock, the t.bone GT Transmitter 863 MHz TWS - guitar transmitter for t.bone EWS/TWS systems. Transmitter is built into the jack with 16 switchable frequencies (between 863-865MHz), 10mW HF-power. Requires 1x 1.5V AAA battery. Black housing with red battery cover., B-Stock with full warranty, may have slight traces of use