Do you want to listen to the sound from your television through headphones or a wireless speaker? Can do it. Simply connect this device to your television's headphone output. You want to send the sound from your cell phone via Bluetooth to your stereo, but it doesn't have Bluetooth. No problem! It is also possible with this device. Simply connect this device to the audio input on your stereo using the RCA or 3.5mm Jack cable. Transmit the sound via Bluetooth to this device and you're done. Easy! Supported protocols: HFP, HSP, A2DP, AVRCP, SPP; Range: 10 meters; Audio Input: 3.5mm mini jack; Audio Output: 3.5mm mini jack; Compatibility: iOS, Android, Windows; Power: 5V 500 mAh; Battery capacity: 300 mAh; Battery life: approx 8 hours; Battery life in StandBy: approx 72 hours; Charging time: 2 hours.