Features: [Bluetooth 5.0 transmitter + reciever]:Delicacy Bluetooth adapter with newest upgarded CSR8675 chip powered by the latest Bluetooth 5.0, one portable adapter to use as either transmitter or receiver and can pair with 2 devices simultaneously; [HD + Low Latency]:the low latency data transmission will let your favorite movies, games, and TV shows lag-free and you can enjoy HD stereo sound quality at the same time.(Note: Low Latency enabled Bluetooth headphones or speakers are also required; [Dual mode + 24 H large battery]:supporting dual-stream (TX mode & RX mode), transmission can connect two Bluetooth Audio device and receiver can connect two devices at the same time. Bluetooth adapter adopts 600mA battery Standard, charging time is about 3 hours, RX service time could be at least 18H, TX service time could be 24hours; [Optical + 3.5mm aux]:get the maximum flexibility with support for both 3.5mm (aux and RCA) and optical (Toslink) digital, both input and output are supported.(Note: you could not use it for calling since there is not built-in mic); [Easy plug, pair and play]:Plug the digital optical/ 3.5 mm or RCA cable into the jack of computer speakers, home stereo systems or other speaker systems, Easily pairing with the Bluetooth Audio devices, such as TV, Roku, blue Ray, PC, DVD, sound bar and etc. Rx mode: click Previous/next track key, increase/reduce volume by the long press, play/pause music by Bluetooth adapter. Tx mode: mute or recovery, backhaul the device, double clicks to matching status quickly. Support auto turn ON functionality when connected to power.Suitable for any devices(smartphone,earphone,speaker etc) any version of Bluetooth on the market, including: bluetooth 1.0/1.1/1.2/2.0/2.1/3.0/3.1/3.2/4.0/4.1/4.2/5.0 etc. Technical specifications: Bluetooth version: V5.0, Class II. Battery: 600mAH rechargeable lithium battery. Net weight: about 48g. Size: 65 x 65 x 17mm. Operating time in receiver mode: 18 hours. Operating time in transmitter mode: 22 hours. Charging time: 3 hours. Transmission range: 10 m(open area). Audio coding: TX: aptX HD, aptX Low latency, aptX, SBC. RX: aptX HD, aptX Low latency, aptX, SBC, AAC. Package contents: 1 x Bluetooth Transmitter/Receiver Adapter. 1 x Micro USB charging cable. 1 x 3.5mm audio cable. 1 x 3.5mm jack to 2 RCA plug cables. 1 x Digital Optical Toslink Audio Cable. 1 x user manual.