MADRID Specially developed for those who seek a user friendly in-ear Bluetooth earphone with a sleek design and a comfortable fit. The in-ear earbuds offers a close fit that stay securely in place as you go about your day, they isolate noise from your surroundings and give your beats extra punch. Battery life up to 4 hours. FEATURES Bluetooth: Speaker size: 4.0 ?10.0mm Sensitivity: Impedance: 102dB+/-3dB 16?15%? Frequency range: Hands-free with microphone and volume control 2.4GHz-2.48GHz Stand-by time: Play time: 100h 4h Charging: Compatible with Android, iOS and Windows Micro USB, about 1,5h charging time Weight: Weight including packaging: 12g (without packaging) 98g Package size: Packaging size: 200x200x85mm 100x31x120mm