Description‎:‎ Unique in‎-ear design guarantee earphones closely fit to ears and will not fall off when you are working out‎.‎ Meanwhile‎,‎ audio performance has improved greatly‎.‎Main Features‎:‎‎- Waterproof and sweat resistant‎,‎ no matter sweating in gym or running in rainy day‎,‎ it will be with you‎.‎‎- NFC technology‎,‎ isolate noise and let you immerse yourself in the music‎.‎‎- Wireless earphones‎,‎ free from wired‎.‎‎- With drive‎-by‎-wire design‎,‎ all in your hands‎.‎Specification‎:‎Bluetooth‎:‎ V4.1Bluetooth transmission distance‎:‎ 10mBattery‎:‎ 45mAh Li‎-ion batteryTalking time‎:‎ 4hStandby time‎:‎ 100hCharging time‎:‎ 1hCable length‎:‎ 0.6mImpedance‎:‎ 32 ohmFrequency‎:‎ 20 ‎- 20KHz 0.083 Package weight‎:‎ 0.11 kg Package Size‎(‎L x W x H‎)‎‎:‎ 11.00 x 4.00 x 17.00 cm / 4.33 x 1.57 x 6.69 inches Package Contents‎:‎ 1 x Earphones‎,‎ 1 x English User Manual‎,‎ 1 x USB Cable‎,‎ 4 x Ear Hook‎,‎ 2 x Earbud