Input Voltage: Transmitter: 3.7V (Battery Management); Receiver: 3.7V (Battery Management) Pairing Current: Transmitter: 11mA; Receiver: 8~12mA Working Current: Transmitter: 20mA; Receiver: 20mA Frequency Range: Transmitter: 2402MH2-2480MHz; Receiver: 2402MH2-2480MH2 Modulation Method: Transmitter: Gfsk; Receiver: Gfsk Transmission Rate: Transmitter: 1m/S; Receiver: 1m/S Pairing Method: Transmitter: Automatic Pairing; Receiver: Automatic Pairing Channel Bandwidth: Transmitter: 192K; Receiver: 192K Transmitter Sending Power: 6-8dbm Receiver Receiving Sensitivity: -94dbm Transmitter Input Level: 125mv (Adjustable Gain) Transmitter Input Impedance: About 5k Receiver Output Level: 693mv (Adjustable Gain) Receiver Output Impedance: 1 ohm Input To Output Gain Ratio: 5.53 Frequency Response Range: 20-20K Hz Delay Time: 20ms Sampling Rate: 44.1K Signal-To-Noise Ratio: 86.4db (Input 125mv, 1k A-) Distortion: 0.05% (Input 125mv, 1k A-) Dynamic Range: 87.278db Barrier-Free Distance: 30m Colour: Material:plastic Size:8.95 x 2.63 x 1.7cm Package Contents: 1 x Receiver 1 x Transmitter 1 x Usb To Dual Micro-Usb Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. High-Quality Audio, Low-Latency Output, Equipped With Advanced Chip Technology, Anti-Interference Continuous And Stable Output Wired To Wireless, Portable, The Shackles Of Wired, More Convenient To Play Musical Instrument Wireless Audio Transceiver, Strong Anti-Interference / Strong Penetration / Wide Compatibility One-Button Switch, Automatic Pairing, Switch On And Automatic Pairing Connection, Plug And Play 30 Meters Long-Distance Transmission, Up To Half A Football Field, High-Quality Transmission Anti-Interference Signal Stability