High Quality NEW!!! Bluetooth Version: 5.0 Bluetooth Chip: BK3266 Transmission Range: About 10 m Charging Time: About 1.5 hrs Music Play Time/Talk Time: About 12 hrs Standby Time: About 300 hrs Speaker Size: 6 mm Frequency Range: 20~20,000 Hz Neck Line Length: 300 mm Sensitivity: 105±3dB Impedance: 32Ω Battery Capacity: Li-Polymer Battery 3.7V/135mAh Battery Life: About 12+ hrs STABLE CONNECTION - Integrated Bluetooth 5.0 chipset brings fast & efficient transmission up to 3 times faster & achieves even richer sound details. CALLING WITHOUT NOISE - Equipped with MEMS noise reduction microphone to eliminate environmental noise. CHARGES FAST - Around 1 hr of listening time on only 5-10 minutes of charging! NEVER FALL OUT - Comfortable fit for all kinds of ears. Comes with 4 Extra Earplugs! IPX5 WATERPROOF - Truly sweat proof technology. DUAL DYNAMIC DRIVERS - Built-in parallel double moving coil built-in two 6mm moving coils, 4 units work, stereo bass effect & output more layered clear vocals. BUILT-IN MICROPHONE - Simply connect the earphones with your smartphone & you will receive incoming calls on the Bluetooth earphones. You can easily pick up & answer the incoming call via the light control panel!