Product parameters Product Name: Bluetooth Headphones Bluetooth Version: Bluetooth V4.0 + EDR The latest version of A2DP 1.2 and AVRCP 1.0 profiles support Supports Bluetooth headset and handsfree profile (HFP 1.5) RF Frequency Range: 2.402-2.480GHZ, 2.4G ISM band Radio Performance: Receives Sensitivity of -84dB/0.1% BER SNR: 95dB Rechargeable 400 mAh Li-Polymer Battery Speaker Drive Unit: 40mm Impedance: 32Ω Frequency: 20Hz ~ 20KHz Microphone: Omnidirectional HD Microphone Distortion: ≤ 0.1% Normal charging time: About 2-2.5 Hours Talking Time: Up to 10 Hours Standby time: UP to 250 hours Compatibility: For Mobile Phone, Tablet, PC, Notebook, MP3,MP4 etc Characteristics 1.Support all audio devices that have Bluetooth capability, such as, cell phone ,tablet PC,laptop,computer etc. 2.3.5mm audio jack, provides a simple wired connection of a variety of devices without Bluetooth. 3.High-sensitive, multi -directional speaker for virtual surround sound 4.Playing time up to 7 hours, and continue talk time up to 8 hours, standby time up to 120 hours. 5.Support TF card ,Bluetooth Aux Function,Wireless Your Music 6. Best Choice for listening music, watching movie, chatting online etc.