Specification:  Optical axis (coaxial) output sampling rate: 192kHz/24bit.  Describe: Transmitter, Receiver.  Operating Voltage: 3.6-5.5V DC.  Working current: Max 250mA, Max 100mA.  Ambient temperature: 0-85℃.  The actual working frequency range of the module: 749-770NHz.  Modulate heatstroke prevention: Pi/4DQPSX.  Channel spacing: 4MHz.  Frequency selection method: Provide channel one-way loop selection Provide automatic tracking search.  Frequency stability: +/-100KHz.  Module actual working channel: 20CH.  Module channel interval: 1MHz.  Sending and receiving distance: 100 meters (in an open place, the test uses a transmission power of 100mv).  Transmit power: 1-100mv(default 100mv).  Receiving sensitivity: -95dBm.  Input level: Max 1.0Vpk.  input resistance: 10k ohm.  Input and output interface: 3.5 audio output, 192kHz optical output, coaxial output.  Stereo output level 1: 30mW RL=32.  Stereo output level 2: 50mW RL=32.  Output impedance: 1k Ohm.  Output-input gain ratio: 1:01.  Frequency Range: 20-20000Hz.  delay: 2.5ns.  Sampling Rate: 3.5 AUX: 48KHz/32bit: Optical axis (coaxial): 192kHz/24bit.  Signal-to-noise ratio: 95dB.  Dynamic Range: 90dB.  Left and right channel isolation: 85dB.     Feature:  Support through-wall transmission: it can transmit through obstacles such as walls, ceilings, wood, glass, etc., to solve the problem that Bluetooth cannot obstruct transmission.  Support one sending and multiple receiving: up to 1 sending and 20 receiving, receivers can be purchased separately to add receivers.  Transmitter TX: Transmit Bluetooth wireless audio from laptops, mobile phones, set-top boxes, Bluray DVDs and other devices, 3.5mm or RCA output audio signal (need to purchase an adapter cable).  Receiver RX: Decode the received audio signal and transmit it to active speakers and amplifiers, etc. Any equipment with optical SPDIF, coaxial 3.5mm or RCA input.  Transmitter applicable equipment: mobile phones, computers, laptops, tablets, iPads, TV boxes, etc.  Receiver applicable equipment: speakers, headphones, etc.     Transmitter connection method:  1.3.5mm audio output port connection: if the signal is interfered during audio transmission after the power is connected, it can be solved by switching the channel through the channel button (CH) of the sender when the power is on. Each time you press the switch key to switch a channel. Please select the channel with the best sound quality, there are 20 channels to choose from. The channel will be updated automatically after the receiving end is powered on again.  2. Bluetooth connection: Turn on the phone's Bluetooth, search for LZXBT and connect. When using Bluetooth connection, do not plug the audio cable into the AUX IN port.  Receiver connection method:  Support coaxial/3.5AUX/optical fiber connection equipment.     Two power supply methods:  1. Use the USB interface of the computer, speaker, set-top box and other equipment to supply power.  2. Powered by a charging plug with a USB interface.     Package Included:  1 x Audio Transmitter(Other products are not included).  1 x Audio Receiver.  2 x Audio Cable.  1 x User Manual