The Bluetooth Mono Headset BTH-04 is a small and stylish headset. It is also very comfortable to wear all day long, because it weights only 9 g - you do not even feel wearing it! The ear hook can be adjusted to fit individual preferences. It covers a range of up to 10 m from your Bluetooth device like your mobile phone or PDA. Excellent communication quality is enabled by a high grade microphone. The air-cushion ear piece closes the speaker up with the ear's auditory canal to improve the hearing quality further. Technical Data General Radio: Carrier Frequency: 2.4 ~ 2.4835 GHz. Bluetooth Class 2: Up to 10 meters in open space. (The maximum operating range depends on the paired phone model, battery power, and environmental factors.) Bluetooth Standard: Bluetooth v2.0 + EDR Spread Spectrum: FHSS (Frequency Hopping Spread Spectrum). Bluetooth Profiles Supported: HSP (Headset 1.1 Profile), HFP (Hands-free 1.5 Profile). Input Power: 5 V, 200 ~ 500 mA, AC adapter. Antenna: Chip Antenna. Battery: 3.7 V, 120 mA, Rechargeable Lithium polymer battery. Standby Time/Talking Time: Up to 200 hours/4 hours. LED Indicator Status: Blue: Power on mode or Full charged Red: Low power or being charged Blue & Red: Pairing mode. Operating Temperature: -10 ~ +55 degree centigrade. Dimensions/Weight: 42 x 18 x 11 mm/9 g. Certificates: CE, RoHS. Package Contents: * Bluetooth Headset BTH-04 * USB Charging Line * Ear Hook * User's Guide * (Optional) Travel Charger/Car Charger