1. 3 channels selection for the transmitter.
2. Double PLL system for ultimate frequency stability.
3. Operating distance up to 100 meters.
4. Active noise reduction system for crystal clear sound.
5. Auto mute and auto tuning functions.
6. Built-in 40mm Mylar speakers.
1. Carrier frequency: (1) For Europe: 863.5, 864 and 864.5MHz. (2) For USA: 914, 914.5 and 915MHz. 2. Frequency response: 30 to 20,000Hz. 3. Channel separation: greater than 35dB. 4. Distortion: less than 1%. 5. Power supply of transmitter: 12V DC/ 150mA. 6. Power supply of headphone: 2 x AAA batteries.