Bluetooth Headset In-ear Small Headset Invisible Standby Sports Driving Specification: small portable design, portable, small and no burden hours of continuous enjoyment,Lightweight and comfortable on the ear Digital display of power, power is clear at a glance.The numbers are displayed from 1 to 9. 9 is fully charged, which is more intuitive and easy to observe Hard core Bluetooth 5.3, faster and more stable Battery: 100 pure cobalt lithium battery, listening to music continuously for about hours. Antenna: ceramic antenna, signal barrier 10m Parameter: pairing Name: M5 Bluetooth version: V5.3 Battery: 100mah Charging time: about 1 hour Talk for listening to music: about 10 hours Frequency: 20Hz-20KHz Impedance: 32 Ω Sensitivity 85db/mw grade IPX 5 Bare metal size: about 2.5x1.2x1.3x1.8cm Bare metal weight: about 3G Package: 1 x Bluetooth Headset 1 x charging cable