Up to 25 Hours of Battery?This Bluetooth TV adapter is built-in 450mAh battery, it can be used continuously for 25 hours when takes only 2 hours to fully charge the device by using a Type-C fast charging cable (Included in the package). When it is in low power state, the adapter can be plugged into the power supply for charging while working. Ensures enjoying your favorite wireless content all the time. Stable Connection?With Bluetooth 5.0 technology, Giveet Bluetooth transmitter receiver adapter would reduce power consumption and offer a fast and stable transmission, boast high fidelity stereo sound and pick up music losslessly and wirelessly. Dual Link & Multipoint?In TX mode, Giveet Bluetooth transmitter can be paired to two Bluetooth Headphones or speakers, and streams audio to both of them simultaneously, which allows you to share the joy of music or movies with your friends or your families. In RX mode, it can be paired to two phones or tablets, but it can only receive audio from one of the two paired devices. Moreover, when you turn on the BTI-038 again, it will automatically re-connect the last connected devices. OPTICAL, 3.5mm AUX & RCA?Giveet Bluetooth TV adapter provides 3 types of audio connections: 3.5mm AUX, white/red RCA (via the included 3.5mm to RCA cable adapter), Optical. More flexibility for you to connect your devices via different cables. NOTE: For TV optical output – please set the TV audio format to PCM. Dolby/DTS is not supported. 2-in-1 Bluetooth Transmitter Receiver?Giveet BTI-038 could be switched easily between the transmitter (TX) mode and the receiver (RX) mode. In TX mode, it is plugged into non-Bluetooth audio sources like TV/PC/ Airplane/MP3 player via Optical/AUX/RCA jack, then you can easily transmit audio to Bluetooth speakers/headphones wirelessly. In RX mode, the Bluetooth receiver can be connected to a wired speaker/wired earphone/car stereo and receive audio from smartphone via Bluetooth.