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ST-1908 Wireless Neck Strap In-Ear Headphones with HRM

A better headphone experience, not only with heartrate function, but also a more sensible and high quality speaker and microphone technology

Bluetooth version: V5.0
Chipset: SBS 2000 by WBD101
Battery Capacity: 120mA
Standby Time: Up to 7 hours
Music playing time: about 5 hours (without HRM function); 4 hours (with HRM function)
Charging Time: about 2 hours
Distance: more than 10 metres (outdoor without blockage 360.)
Speaker: c 8.6mm
Speaker Sensitivity: 94+/-3dB
Microphone sensitivity: 42+/-3dB
IPX4 water resistance