The CH88 handheld transmitter for Concert 88x/88a/288m uses the Q7 dynamic capsule with a super-cardioid pickup pattern for strong off-axis rejection. It provides adjustable input gain, a silent mute button, and a power/mute status indicator. Powered by two AA alkaline batteries, it delivers up to eight hours of continuous operation. RF power is 10 mW EIRP; dimensions are 260 mm x 54 mm and weight 218 g.