1. Slide switch for three channel selection.
2. Double PLL system for ultimate frequency stability.
3. Operation distance up to 100 meters.
4. Auto mute function available for headphone.
5. Auto power off function for headphone.
6. Built-in 40mm mylar speaker.
1. Carrier frequency: (1) for Europe: 863.5,864,864.5MHz. (2) For U.S.A: 914, 914.5, 915MHz. 2. Signal to noise ratio: >75dB. 3. Frequency response: 30 to 20,000Hz. 4. Channel separation: >35dB. 5. Distortion: <1%. 6. Power supply of transmitter: 12V DC 150mA. 7. Power supply of headphone: 2 AAA batteries.