EM60 200m Power Amplifier Audio Transmitter Universal for Computer Mobile Phone Tablet, US Plug 1. Silent Disco wireless disco system 2. Using the UHF ISM frequency band in Europe and the US, the transmission distance of open space up to 200 meters 3. Adopt advanced phase-locked loop technology to make the working frequency more stable 4. The use of active noise reduction technology makes the signal-to-noise ratio above 70dB and the separation up to 50dB, almost no noise is felt, close to the level of wired headphones 5. No sound source automatic shutdown design, when there is no sound source, the transmitter will automatically shut down after 5 minutes, avoiding stray interference 6. Countless headphones can be connected to one transmitter at the same time. The transmitter has 3 channels, and users can choose their favorite music as they like. 7. Can be connected to any device with 3.5mm audio interface or RCA interface, such as mixer, computer, mobile phone, DVD, TV, CD, etc. Specification 1. Headphone output audio source: PCHifiTVDVDCD 2. Whether wireless: wireless transmitter 3. Uses: family party, large stage party, square dance, fitness, yoga, conference, travel, broadcasting, cinema, etc. 4. Plug diameter: 3.5mm 5. Wire length: 3m 6. Horn diameter: 40mm 7. Sensitivity: 10dB 8. Frequency response range: 20-20KHz 9. Distortion rate: less than 1% 10. Impedance: 32Ω 11. SNR: >=75dB 12. Distortion rate: