feature 

 1: Exclusive 2.4G codec encryption and decryption algorithm, strong transmission confidentiality 

 2: The wireless transmission distance is 20-30 meters (test in an open environment without blocking) 

 3: Adopt adaptive frequency hopping communication algorithm, strong anti-interference 

 4: Support reverberation and noise reduction functions 

 5: Simple pairing and connection 

 6: Low latency (15-20ms)

Technical Specifications (Transmitter Module) 

 Working voltage: 3.3-5.0V 

 Working current: 14mA 

 Working frequency: 2.400-2.485GHZ 

 RF output power: +6dbm 

 Antenna Type: PCB Onboard Antenna 

 Audio ADC sampling rate: 16Bit/48Khz/64Kbps 

 Audio ADC frequency response range: 20Hz-20KHz 

 Microphone Sensitivity: -36db 

 Dimensions: 24.5x15.3x3mm 

 Weight: 1g 

 Transmission delay: 15-20ms (the delay from the input audio signal at the transmitter to the output audio signal at the receiver) 

 Communication distance: 20-30 meters (open and unobstructed environment) 

 Transmission method: one send and one receive

1: button 

 Short press: cyclically select the noise reduction level, and cycle between "noise reduction off" => "mild noise reduction" => "moderate noise reduction" => "deep noise reduction", each time you turn on the power, the default "noise reduction off" ". 

 Long press: long press for 2 seconds to clear the pairing memory, and re-search for nearby receivers. After the receiver is found, it will automatically connect and memorize, and it will automatically connect to the memorized device next time it is powered on. 

 Double-click: Double-click the button each time to switch between "open reverb/close reverb", and default "close reverb" every time you start the machine. 

 Note: 

 About noise reduction: The noise reduction function can effectively remove ambient noise such as wind noise, vehicle driving noise, mixed human voices in a noisy environment. Of course, it is not that the higher the noise reduction intensity, the better. The higher the noise reduction intensity, the more your own voice will be intercepted. You can choose the noise reduction level according to the specific use environment. 

 About reverb: The reverb function can produce multiple gradually weakened reverberation effects, which can beautify the human voice, suitable for singing and speech environments. 

 2: Status indicator 

 The status indicator is red and blue two-color lights, the following are several status descriptions 

 Waiting for connection (no connection): red and blue flashing alternately (red light on for 500ms, blue light on for 500ms) 

 Connected: The blue light flashes twice within 5 seconds 

 3: 0R resistor connected in series with the onboard microphone signal 

 Removing this resistor disconnects the signal input from the onboard microphone to the chip. If the on-board microphone is not required, use an external microphone or input audio signal directly, disconnect this resistor to cut off the signal of the on-board microphone. 

 4: Onboard electret microphone 

 5: Input and output wiring pads 

 (1): 3.3-5V: positive power input, input voltage range 3.3-5V 

 (2): GND: negative pole of power supply 

 (3): MIC-: the negative pole of the external microphone or the audio ground of the external audio signal 

 (4): MIC+: External microphone positive pole or audio signal line

1: Status indicator 

 The status indicator is red and blue two-color lights, the following are several status descriptions 

 Waiting for connection (no connection): red and blue flashing alternately (red light on for 500ms, blue light on for 500ms) 

 Connected: The blue light flashes twice within 5 seconds 

 2: Button (this button is reserved and has no function) 

 3: Input and output wiring pads 

 (1): 3.3-5V: positive power input, input voltage range 3.3-5V 

 (2): GND: power ground (power negative) 

 (3): AGND: Audio ground. Audio signal reference ground, connect to GND at the power supply end filter capacitor to reduce digital noise (AGND must be connected to GND outside the module). 

 (4): OUTL/MIC: left channel audio output, microphone audio signal output (because the use of one-to-one microphone is mono, so the OUTL and OUTR signals are the same mixed output, regardless of the left and right channels) . 

 (5): OUTR: Right channel audio output (because the one-to-one microphone is used for mono, so the OUTL and OUTR signals are the same mixed output, regardless of the left and right channels). 

 (6): CON: key port line (reserved, no function). 

 (7): LINK: Paired connection status output, with connection output high level 3V, no connection output low level 0V.