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Measuring the heart rate TJ040442
Measuring the heart rate headphones
Bluetooth version: V4.1
Bluetooth program: ACTS
Battery capacity: 120mA
Standby time: 360 hours
Music playing time: about 7 hours
Charging time: about 1.5 hours
Distance: more than 10 meters 
(outdoor without blockage 360°)
Speaker: ¢ 12mm
Speaker sensitivity: 97 +/- 3dB
Microphone sensitivity: 42 +/- 3dB
Support AAC audio decoding
heart rate , step count and mp3 function