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: 3.65VConsumption Current: <110mAOperating Temperature: 070 Degrees CelsiusFrequency Range: 550585MHzChannel Number: 20Modulation Mode: GFSKTransmit Power: <10dBmInput Impedance: 15KInput Level: 2.8Vp-p (Max.)Audio Delay: <1.5msFrequency Response: 4018KHz, plus or minus 3dBReceiver:Power Supply Voltage: 3.65VConsumption Current: <110mAOperating Temperature: 070 Degrees CelsiusFrequency Range: 550585MHzChannel Number: 20Modulation Mode: GFSKReceiving Sensitivity: -85dBm (Min.)Output Impedance: 2.2K OhmOutput Level: 2.8Vp-p (Max.)Audio Delay: <1.5msFrequency Response: 4018KHz, plus or minus 3dBMaterial: ABSItem Size: 140 * 43 * 23mm / 5.51 * 1.69 * 0.91inItem Weight: 90g / 3.19ozPackage Weight: 172g / 6.07ozPackage Size: 12.8 * 11.2 * 4.2cm / 5.04 * 4.41 * 1.65inPackage List:1 * Transmitter1 * Receiver1 * USB Cable