2 device. Enjoy your music with 2 speakers in STEREO. Answer your calls hands-free using the Voice Answer function. Listen to your smartphone Navigator indications Follow your GPS instructions Talk to your passenger, connecting with any other Twiins or BT INTERCOM compatible device Intuitive: only one control button integrated on microphone. Bluetooth V.3.0 HQ sound and NosieReduction Technology. New casing. new Micro. New charging port. 100% compatible with all cellular phones and smartphones Bluetooth®.