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This new Trands In-Ear Bluetooth Mono Headphone With Built-In Mic Wireless hands free Mono Earphone Black is made with specifications as follows, Bluetooth Version 4.1, Chipset: WT200S, Bluetooth Working Frequency: 2.402GHz - 2.480GHz, Music Play Time: Around 12 hours (80% Volume), Talk time: Around 12 hours (80% Volume), Standby Time: About 120 hours, Magnetic Absorption Earbuds, Connect 2 phones Simultaneously, Built-in Microphone, Music & Call Control, Better Signal Quality, Charging Time: Around 2.5 hours, Working Range: 10 Meters, Battery: 3.7V/170mAh, Frequency Response: 50Hz - 20KHz, Speaker: 10mm Dia, Impedance: 32Ohm, Speaker Power Rating: 3mW, Charging Criteria: DC 5V - 500mA Micro USB, Sensitivity: -85dBm, Water proof & Sweat proof, Rain Friendly & Sweat friendly.