Color: Black - Plastic material housing - Bluetooth version: 2.0 - Up to 500 meters working distance between two BT interphones real two-way wireless - Effective operation up to 120km/h speed - 10 meters Bluetooth working range - Wireless hands free communication for motorcyclists and skiers - Support headset profile Hands-free A2DP profile - Works with any Bluetooth equipped mobile phone or MP3 for stereo music - FM frequency: 87~108MHz - Fits any motorcycle helmet - Wind and noise compensating microphone with slim headset speaker - Drive safely while talking with friend - Built-in 350mAh battery - Standby time: 200 hours - Talking time: 5 hours - Charging time: 3.4 hours - Package included: - 1 x BT interphone - 1 x Rider speakers and microphone (60cm-speaker cable / 10cm-Mic cable) - 1 x Helmet mount kit set - 1 x 3.5MM to 2.5mm audio cable - 1 x Power adapter (AC 100~240V / EU plug / 130cm-cable) - 1 x 2-flat-pin plug adapter - 1 x English user manual