1.2 in 1 Adapter for Bluetooth---In transmission mode(TX), audio can be wirelessly transmitted to devices for Bluetooth. In receiving mode(RX), this adapter activates your stereo system to receive music from phones for Bluetooth2.High Definition and Low Delay and LED Display---Equipped with the latest CSR 8675 chip and for Bluetooth 5.0, high Definition and Low Delay less than 40ms, technology is a perfect synchronous audio-visual experience. The LED display screen is easy to understand the connection content and status of the product.3.Dual Mode and Automatic Reconnection---The transmitter for Bluetooth (TX) can pair two devices for Bluetooth at the same time to avoid disturbing others. RX/TX mode can realize the automatic back-to-back connection, and the connected products have a storage function.4.Optical fiber and RCA and AUX cable---It supports 3.5mm (AUX and RCA) and optical fiber (TOSLINK / SPDIF) input and output. This adapter is suitable for mobile phones, MP3, MP4, notebook computers, earphones, car speakers, speakers for Bluetooth or earphones with A2DP Bluetooth configuration files.5.RX more than 18H, TX more than 22H, and 10M range---Built-in 600 mAh battery, charged by USB, can work for up to 20 hours, charging time is 3 hours, battery warning (5 minutes on). The radio range is 10 m (barrier-free).Specification:Type:for Bluetooth TransmitterConnectors:for Bluetooth WirelessBattery Type:Built-in 600 mAh batteryCharging Time:3 hoursRadio Range:10 m (barrier-free)Working Time:up to 20 hoursColour:blackMaterial:PCSize:6.7x6.7x2cmPackage Contents:1 x Bluetooth Transmitter/Receiver Adapter1 x Mini USB charging cable1 x 3.5mm audio cable1 x 3.5mm jack to 2 RCA plug cables1 x Digital Optical Toslink Audio Cable1 x User manualOnly the above package content, other products are not included.Note: Light shooting 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.