Lookatool Bluetooth 4.1 Audio Receiver A2DP Wireless Adapter for Home Music Sound System It supports audio input audio equipment, wireless audio transmission. Compatible with lossless audio formats. Support AUX OUT. Built-AEC echo cancellation and noise cancellation circuit ANC, gorgeous stereo sound more pure. Built-in enhanced signal transmission circuit connected faster and more stable tone continues. Work lights: Red and blue lights flashing alternately: Device No connection status. Blue lights flashing: Bluetooth device is paired connection. A long red light: state of charge. Automatic memory connectivity, operating more simple, more convenient connection. Built-in battery, long life time. Bluetooth 4.1, low power consumption. Live voice prompts, simple and clear. Smart compatible, Android, IOS phone system and PAD, and all Bluetooth audio devices. Simultaneously connect two phones. Mini Bluetooth 4.1 Audio Receiver A2DP Wireless Adapter for Home Audio Music Streaming Sound System & Bluetooth Car Kits with 3.5 mm Stereo Output for Smartphones & Tablets. Compatibility: Android system, mobile phone or tablet IOS system, and all Bluetooth audio devices. Transmission distance:&gt; 20M (open area). Operating Current: 18-28MA. Battery Standard: 300MA. Working Hours: 8-10H. Charging Time: 3H. Output connections: 3.5MM stereo jack. Bluetooth Version: 4.1.