【Reactivate non-Bluetooth Devices】Bluetooth audio adapter with 3.5mm AUX cable / connector can turn those non-Bluetooth devices into Bluetooth-enabled ones, such as home stereos, car speakers, TVs, amplifiers, soundbars. | 【Bluetooth Transmitter and Receiver】This adapter can be a transmitter or a receiver in the 2 optional modes (TX and RX), TX mode (red light) is for a transmitter and RX mode (blue light) is for a receiver. | 【Bluetooth 5.0 + EDR】Bluetooth 5.0 EDR ensures more stable connection, faster transmission up to 2.1 Mbps, larger range up to 33 feet, lower power consumption. | 【10 Hours Playtime】Bluetooth adapter built in 300mAh battery for up to 10 hours of use makes you enjoy wireless music anytime, it also works while charging. | 【Very Easy to Use】No more driver, no more setting, plug and connect. | 【Note】Considering the usage scenario of a transmitter, the +/- buttons of the transmitter are unusable, which is not a fault.