Model Number: TST-JD-Bluetooth HF 01 Brand Name: TST Key Specifications/Special Features: Bluetooth specification: v3.0+EDR class 2RFFrequency range: 2.402-2.480GHz, 2.4G ISM brandRadio performance: receiver sensitivity of -90dBm, TX power max 4dBmSupports Bluetooth headset and handsfree profilesOperating distance: about 10 metersNominal charging time: max 1.5 hoursWork time: about 10 hours aroundImpedance: 32 ohmStandby time: up to 250 hoursMicro USB charging portCharger adapter output: DC 5V & 130mAColors: white, black, red, blue, pink and orange