ER1712B Features Bluetooth v3.0+EDR stereo headset Can match with 2 mobile phones at the same time Equipped with speaker and high sensitivity microphone Supports Hands-free， Headset and AVRCP Bluetooth protocols Built-in DSP noise suppression and echo cancellation function General Specs Brand & Model XN-393 Working Frequency Range ISM (2.4-2.48GHz) Working Range Up to 10 meters Bluetooth Version v3.0+EDR Bluetooth Mode Hands-free/Headset/AVRCP Speaker Yes Microphone Yes Battery Type 3.7v 500mA lithium battery Talk Time About 15-16 hours Standby Time About 48 days Charging Time 2-3 hours