Marsboy 2-in-1 Bluetooth V4.1 Transmitter Audio Receiver Adapter for Headphones TV PC and More 2-in-1 Function: 1) Enable Bluetooth Receiving for speakers, headphones and more. 2) Enable Bluetooth Transmission for MP3, CD / DVD players, e-readers, TVs and more. (Suitable for all 3.5mm media devices) With the Best CSR Chip: CSR8670. Battery life for TX mode: up to 10 hours; battery life for RX mode: up to 9 hours. So Easy to Use - One-button switch to shift between transmitter(TX) and receiver(RX) mode. Bluetooth V4.1 + EDR. Supported Bluetooth Protocols: A2DP & AVRCP. Support APT-X & SBC. Operation Range up to 33ft/10m. Product comes with 12-month warranty. 24/7 customer service available.