Valdus VS-73 Neckband In-Ear Earphone with with Voice Change, Vibration & Magnetic On/Off

DescriptionWireless version: Wireless 5.4Frequency: 2.4GHzWorking range: 10 metersBattery capacity: 300mAhSpeaker size: 13mmImpedance: 320±15%Music time: 55 hoursTalk time: 50 hoursCharging time: 1 hoursFrequency response: 20-20000Hz