-3Play will connect up to 3 smartphones or tablets simultaneously. No need to unpair the 1st device to pair the next device. Just hit play on any of the 3 paired devices and the previous device pauses and the next one takes over the party- Plug the 3play Bluetooth adapter into any stereo, powered speakers, or car audio systems RCA, mini or digital toslink input- Power the 3play via included USB or power supply. Integrated battery last 8 plus hours of portable playtime-Supports aptX, AAC and SBC High bit rate- Works with any Bluetooth enabled device. For older android devices the free Grace 3play Bluetooth app may be required to optimize the 3play party functionality. After the initial installation the app works completely in the background when streaming to your 3play.