[Large Capacity Battery Support] Equipped with a 500mAh charging case, the m51 ensures nearly 80 hours of music/call time for your Bluetooth earpiece. The single headset offers 15-20 hours of usage time, providing flexibility for extended use. Choose between two charging methods to address any battery concerns

[Dual Microphone Noise Reduction] Experience superior call quality with the noise-canceling earpiece featuring enc dual-mic noise cancellation technology. With CVC8.0 & ENC, it effectively blocks 96% of noise and eliminates echo, ensuring crystal-clear calls even in noisy environments.

[Newest 5.4 Bluetooth Technology] Stay connected seamlessly with the latest 5.4 Bluetooth technology of the wireless earpiece. Quickly and stably connect devices within a 15m range, with the convenience of dual connection to link two devices simultaneously. Compatible with iOS, Android, Windows, and more.

[One Button Mute] Ensure your privacy with ease using the one-button mute function. Simply press the button to quickly mute the microphone, providing peace of mind at any moment. 

Product Specifications：
1. Bluetooth version: V5.4. 
2.Bluetooth chip: QCC3040
3. Supported protocols: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3
4. Speaker unit: φ8MM  32Ω
5. Transmission distance: 10-15m
6. Headset battery capacity: 50mAh
7. Charging case battery capacity: 500mAh
8. Standby time: 6 months
9. Music playback time: 8-15 hours
10. Headset charging time: 1 hour
11. Charging time of charging case: 2 hours
12. Charging port: Type-C
13. Working temperature: -10° C-50 ° C
14. Headset weight: 16.5g

15. Charging case weight: 64.1g 

Two Devices ConnectionThis headset can connect to two devices at the same time. After successfully connecting to phone A, turn off the Bluetooth function of phone A and headset. Next, restart the headset and connect to phone B. Keep phone B connected, turn on the Bluetooth function of phone A, findthe “m51” in the list of Bluetooth devices and click to connect.( NOTE: Although the headset can connect to two phones at the same time, only one of the phones can play music through m51, the headset cannot play music from two phones at the same time. ) 

Common Problems 

1. Low battery may cause disconnection, in order not to affect normal use, please charge the headset in time. 
2. If the headset fails to turn on, please try to charge it up first, and turn it on when the battery is sufficient. 
3. No sound can be heard from the headset when in a call.
 —— Make sure you choose the m51 for audio input/output when in a call, but not the speaker on your cellphone. 
—— Check whether your cellphone has been connected to other Bluetooth devices. 
—— Make sure the distance between the headset and the cellphone does not exceed the effective distance of 15 meters. 
4. The other end cannot hear your voice when in a call. Please keep the microphone hole of headset clean, so as not to affect the call and noise reduction effect, resulting in the other end can not hear your voice. 
5. The headset cannot be charged. Please wipe the charging contact point of the headset and the charging case with alcohol. 

Packing List:Headset*1+Charging case*1+Charging cable*1+User manual*1+Ear cap (S)*1+Ear cap (M)*1