pecifications: Color: Gray All buttons and ports: - ON / OFF, LED Indicator, Multi-function Button, Volume -, Volume +, Charging Socket Bluetooth Standard: for Bluetooth Version3.0 +EDR Working Frequency Range: for ISM 2.4Ghz to 2.4Ghz Bluetooth Profile: Speaker phone & hands-free Transmitting Power: Class 2 Wireless Connecting Distance: 0-10 meters Charger Output: DC 5V-6V, 400mA Built-in Rechargeable Battery: 3.7V 650mA