Connectivity: Bluetooth 4.0 Heart rate sensor: Earlobe/fingertip infrared heart rate sensor Compatible Application (HRV): Elite HRV, HeartRate+, Coherence PRO (including but not limit to such application, you may discover more and share with us.) Compatible devices: iPhone 5 or newer (with Bluetooth 4.0 or newer), selected android phones (not all android phones, because there are so many many android phones on the world) Battery: rechargeable lithium battery (included) Remarks 1) Some HRV needs users to pay and then could download or use some certain functions, our price does NOT including the application 2) And some applications may have requirements on the hardware devices or device system version 3) Color: Black/Blue/Red

Product name: Earclip Bluetooth mobile phone heart rate meter

Product model: HRM-2935

Material: ABS;  Wire: TPU

Output mode: Bluetooth 4.0

Counting accuracy:+5% or - 5% (according to the tester)

Basic functions: real-time heart rate change, Bluetooth 4.0 transmission

Battery: rechargeable battery 150MAH, 3.7V, charging time 2 hours, life 500 times