AGPtEK Wireless Foldable Bluetooth Over Ear Headphones with Microphone, High-Fidelity Stereo HD Sound for Smartphones, Tablets and PC 1. BLUETOOTH 4.0 VERSION: AGPtek bluetooth headphones with mic ensure high-fidelity stereo music and clear speech via Noise Isolation. 2. ULTRA-LONG OPERATION AND CAREFREE CALLING: AGPtek wireless headphones is with high quality lithium ion battery 320mah lithium battery, comes with ultra-long 15 hours music, 14 hours talk, 300 hours standby. 3. COMFORTABLE WEARING: Custom fit supra-aural soft earmuffs, artificial protein leather of earmuffs simulated to human skin texture, ensure long lasting comfort in various rugged circumstances of this foldable headphones. 4. CONNECT 2 DEVICES AT THE SAME TIME: Pair this over ear headphone with two Bluetooth-enabled devices at the same time and don't miss your calls when you have two cell phones! 5. STRONG WIRELESS SIGNAL: you can enjoy skip-free music in a 10-meter working distance of AGPtek noise cancelling headphones.