Searching of a earphone? Our in-ear wireless earphone set will be the for you. Made of material, durable enough for your long-term use. Practical and portable design, ensures its popularity. Features -Color: Black -Material: ABS -Size: 6.00X4.20X1.70cm/2.36X1.65X0.67in - Ergonomic design, comfortable and stable to wear, not easy to fall off. - You can wear it on your left or right ear, you can while wearing eyeglasses. - Noise reduction, , clear sound quality. - Can listen to music and notice the surrounding environment at the same time. - Long standby time, easy to charge, no more worry about running out of power. Specifications Transmission distance: outdoor straight line distance of 15 meters Headphone battery capacity: 30mAh Charging bin battery capacity: 400mAh Speakers: 10mm speakers Listening time: 3.5 hours Talk time: about 4 hours Standby time: 120 hours Charging time: 50 minutes Operating current: 5-10mA Operating voltage: 3. -4.2V Distortion: < 0.1% Signal-to-noise ratio: > 90dB Frequency corresponding: 20-20KHz Transmitted power: 4 Horn impedance: 32 Carrier frequency: 2.4 GHz Package list: 1 x pair of Earphone 1 x Charging warehouse 1 x USB cable 1 x instruction book