Transmitter unit untuk Wireless Tour Guide System 195-230 Mhz Specification : Frequency range 195-230MHz Channel 99 channels Frequency response 50Hz-18000Hz Output power 10mW Frequency stability +/-0.005% Modulation deviation +/-75KHz Power supply Built-in 900mAh lithium battery Working time About 12 hours Charge DC 5V 1A, mini USB jack Working distance Approx 100m (open air) Size 99 x 56 x 14mm / 3.9 x 2.2 x 0.5 in Weight 58g / 0.13lb