This product is 2 in 1, which can be used as transmitter and receiver.It can achieve high-fidelity stereo, which has high performance.It can still work while charging.The large capacity battery can work for 10 hours.Item Name: bluetooth-compatible AdapterMaterial: ABSBattery: Built-in Battery (Included)Features: 2 in1, High Performance, RechargeableSize: 13.5cm x 8cm x 2cm/5.31" x 3.15" x 0.79" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Transmitting Mode:In TX mode, the bluetooth-compatible transmitter can be used to stream audio from a non-Bluetooth audio source (such as a non-Bluetooth TV or CD player) to a bluetooth-compatible headset/speaker. This transmitter supports RCA connector and AUX connector, so please check if your audio source has one of these jacks. Please note that the adapter should be plugged into the "L&R AUDIO OUT" jack or "AUX OUT" jack on the audio source, but not into the "Component IN" jack.Receiving Mode:In RX mode, the bluetooth-compatible adapter can be used as a bluetooth-compatible receiver for non-Bluetooth stereo devices (such as wired headphones or wired speakers). Pair the bluetooth-compatible receiver with the mobile phone, and then plug the earphone into the jack on the unit to hear the music in the mobile phone. Note: If the TV does not have an "AUX OUT" jack or "L&R AUDIO OUT" jack, the headphone jack should also work. If the TV only has a "digital audio output (optical)" jack, you need a converter, or you can choose another model of TrauTronics bluetooth-compatible transmitter TT-BA09, which supports aux audio output and optical audio output.Package Includes:1 x bluetooth-compatible Adapter1 x 3.5mm Audio Cable1 x USB Charging Cable1 x User Manual