CST910 is a UHF FM transmitter module for wireless systems, covering 400–550 MHz with 16 switchable channels within a 7 MHz window. It provides RF output from 300 mW up to 2 W, with externally pre-set High/Low power. Channel spacing options are 12.5, 20, 25, or 50 kHz. Audio input is transformer-balanced and floating, with Micro/Line level control. Power is from 10.5–16 V DC. Dimensions are 123 × 49 × 300 mm; weight about 1 kg. Antenna not included; UPK32 programming kit available separately.