CST910-D is a UHF desktop/rack transmitter module operating 400–550 MHz. It provides 16 preset channels within a 7 MHz switching window and supports 12.5/20/25/50 kHz spacing. RF output is selectable from 2 W to 300 mW with external High/Low presets. Audio input is transformer-balanced, floating XLR3-F, Mic/Line selectable, with peak-limiter. Power is 10.5–16 V DC; dimensions are 123 × 49 × 335 mm and ~1.26 kg. Optional UPK100 programming kit enables PC reprogramming.