CRISP, CLEAR, & DYNAMIC SOUND QUALITY - Made with 40 mm drivers, it's no wonder why these headphones deliver a rich and deep BASS that even an audiophile can appreciate. They also come with a built-in HD microphone so you can make hands-free phone calls- or listen to music- while you work. BLUETOOTH HEADPHONES THAT PAIRS UP EFFORTLESSLY - Unlike other devices out there, SoundPal uses the latest in Bluetooth technology (v4.1) to make pairing QUICK and painless. It only takes a couple of seconds to connect and then you're ready to rock and roll. Considering its 33 feet range, you have a lot of freedom to move around once paired too. FEELS NATURAL TO WEAR OVER YOUR EARS - Not only are the ear covers designed to fit the natural shape of your head; they're made from a soft material that's comfortable to wear for LONG periods of time. Plus, each pair comes with a hard shell case that you can securely pack away without worrying about damaging them.

Hybrid Driver Unit: 40mm moving coil driver, 20*30mm multi-fold AMT Air Motion Technology Impedance 32 Ω +/- 15% at 1KHz, 179Mv Sensitivity: 110 +/- 3dB at 1KHZ w/Vrms input= 179Mv