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TECH SPECS 
Chargingup to 2 hours via micro USB
BatteryLithium ion
Battery lifetalk/music time: up to 5 hours
standby: up to 10 days
Water resistanceIP55 Certified, drop, strength, dirt, temperature & humidity tested
Weight16 grams each
SensorAccelerometer, heart rate sensor
ConnectionBluetooth
SoundPassive Noise Reduction: 15dB
Speaker size: 6 mm dynamic speaker
Speaker sensitivity: 94dBSPLat1mW/1kHz
Speaker max input power: 5mW
Speaker frequency range 20Hz-20kHz
ControlsTouch controls
Otherin-line remote and microphone for making cell phone calls
Microphone type: MEMS microphone solution
Answer/end call, reject call, voice dialing*, last number redial*, volume control, track control, play/pause music, Voice guidance
METRICS 
StepsYes
DistanceYes
CaloriesYes
ActivityYes (interval training, zone training, target pace training, measuring time)
FloorsNo
SleepNo
Heart rateYes
VO2 MaxYes
UV exposureNo
Skin temperatureNo
Galvanic skin responseNo
GPSNo
NotificationsNo
Other metrics
LINKS 
View onAmazon
Amazon US rating3.1 out of 5 stars
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