Feature: 1. 1.5ms audio delay, 550-585MHz working frequency band. 2. GFSK digital modulation/demodulation. 3. The number of preset channels is 20, which can be used for single transmission and multiple reception. 4. The signal-to-noise ratio is 80dB, the dynamic range is 81dB, and the reception sensitivity is 85dBm. 5. The transmission distance is more than 50m from the open area (static). Specification: Features: 1.5ms audio delay, 550-585MHz working frequency band. GFSK digital modulation/demodulation. The number of preset channels is 20, which can be used for single transmission and multiple reception. The signal-to-noise ratio is 80dB, the dynamic range is 81dB, and the reception sensitivity is 85dBm. The transmission distance is more than 50m from the open area (static). Built-in 680mAh rechargeable lithium-ion polymer battery. 270° rotatable 6.35mm plug, widely apply to all audio equipment with 6.35mm jack. Specifications: Transmitter: Power Supply Voltage: 3.6~5V Consumption Current: <110mA Operating Temperature: 0~70℃ Frequency Range: 550~585MHz Channel Number: 20 Modulation Mode: GFSK Transmit Power: <10dBm Input Impedance: 15K Input Level: 2.8Vp-p (Max.) Audio Delay: <1.5ms Frequency Response: 40~18KHz, ±3dB Receiver: Power Supply Voltage: 3.6~5V Consumption Current: <110mA Operating Temperature: 0~70℃ Frequency Range: 550~585MHz Channel Number: 20 Modulation Mode: GFSK Receiving Sensitivity: -85dBm (Min.) Output Impedance: 2.2K Ohm Output Level: 2.8Vp-p (Max.) Audio Delay: <1.5ms Frequency Response: 40~18KHz, ±3dB Material: ABS Item Size: 140 * 43 * 23mm / 5.51 * 1.69 * 0.91in Item Weight: 90g / 3.19oz Package Weight: 172g / 6.07oz Package Size: 12.8 * 11.2 * 4.2cm / 5.04 * 4.41 * 1.65in Package List: 1 * Transmitter 1 * Receiver 1 * USB Cable Package List: 1 * Transmitter 1 * Receiver 1 * USB Cable