Esamconn Bluetooth Receiver, Hands-Free Car Kits, Mini Wireless Bluetooth Adapter for Home/Car Audio System Advanced CSR 4.0 Chip: Get high quality audio sound than the Bluetooth 3.0 version, both in playing music and answering calls. Extra-Long Play Time: Built-in battery provides up to 10 hours' play and talk time, 120 hours' standby time, only takes 1.5 hours to fully charge it. Two-Link: Can connect two bluetooth devices at the same time. Bluetooth range reaches up to 30 feet in open space without obstacles. Wide Compatibility: Compatible with most Bluetooth enabled devices like smartphone, MP3, tablet, etc, ideal for home or vehicle audio systems. Easy Control: You can answer phone calls or control music on the receiver. Change volume, play/pause/skip music, answer calls, redial the last called number with ease.