1. 100 meters transmission distance (330FT) 2. Built-in lithium battery, charge once, battery life 5-6 hours 3. Strong anti-interference, can penetrate walls 4. Built-in damping shaft, 270 degree rotation to adjust orientation 5. Plug and play, lossless sound quality 6. Working channel: Channel 20 7. Receiving sensitivity: -90dBm 8. Frequency response range: 20-20000Hz 9. Frequency range: U frequency 10. Delay time: less than 0.5ms 11. Sampling rate: 64KHz, 16bit 12. Signal to noise ratio: 95dB 13. Distortion: 0.3%@1KHz 14. Dynamic range: 90dB 15. Size: 11.66x3.66x1.63cmSpecification: Package Weight One Package Weight 0.22kgs / 0.48lb One Package Size 16cm * 13cm * 6cm / 6.3inch * 5.12inch * 2.36inch Qty per Carton 40 Carton Weight 8.50kgs / 18.74lb Carton Size 53cm * 34cm * 32cm / 20.87inch * 13.39inch * 12.6inch Loading Container 20GP: 462 cartons * 40 pcs = 18480 pcs 40HQ: 1073 cartons * 40 pcs = 42920 pcs