This product is a wireless audio transceiver that integrates wireless stereo audio transmission and reception. It is suitable for one-to-N wireless audio transmission solutions and is suitable for mainstream electrical appliances on the market (mobile phones, , computers, projectors, smart speakers, etc.). This machine uses a button to turn on and off, and uses an 8-bit address code to distinguish different receivers from receiving the specified transmitter signal without confusion. Only when the address code setting of the receiver is consistent with the address code of the transmitter can they be connected to each other, otherwise they not be connected. As long as the address code is consistent, the transmitter and receiver automatically connect every time they are turned on. The transmitter inputs a stereo audio signal from the 3.5mm audio socket and transmits it to space through a 2.4G ISM band radio signal. After receiving the signal, the receiver verifies and decodes the digital signal, and then outputs a stereo audio signal from the 3.5mm audio socket. In order to the stability of wireless transmission, this machine uses an adaptive frequency hopping algorithm communication mechanism. When it is found that the current channel is congested, it can automatically avoid the congested channel and switch to a relatively idle channel to continue communication. This process is automatic by the program. It adopts 2.4G wireless communication protocol and encoding and decoding algorithm, adopts broadcast transmission mode, and supports multiple receptions with one transmitter (within the signal coverage range of the transmitter, it supports an unlimited number of receivers to receive simultaneously). It supports charging 3.7V lithium batteries. The charging indicator light is red when charging, and the red indicator light is off when it is full. It uses Type-c charging interface (compatible with common for Android phone Type-c charging interface and mobile phone 5V charger). You can also input 5V from the Type-C port to power the board. It can be widely used in application scenarios such as wireless audio transmission, DIY wireless speaker modification, etc. Color: Black Material: PCB Package Contents: 1 x Audio module 1 x 3.5mm Audio 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.