Syba CL-AUD23041 Bluetooth v2.1 + EDR Headphone with Microphone - Retail Packaging - Black Bluetooth Version: 2.1 +EDR.A2DP, AVRCP, HS/HF Standards Headset remote buttons: Volume Up/Volume Down,Forward/Backward, and Multifunction Button (Pairing, On/Off, Answer/End/Refuse Call, Redial, Voice Dialing, Play, Pause) Built-in Rechargeable Lithium Battery Charging Time: 2-3 Hours; Up to 8 Hours for Music; Up to 12 Hours for Talking Compatible with iPhones, Android, iPods, iPads