MT0552B Features Dual band wireless heart rate signal (frequency of emission of 5.3KHZ and Bluetooth 4) Compatible and applicable with may IOS devices，such as Iphone 4s-iphone 6 etc. Support received 5.3KHZ heart rate watch Standard heart rate data transmission to the intelligent mobile phone to realize real-time monitoring of exercise intensity and exercise heart rate bond index by 4 Bluetooth communication technology Heart rate detection range:40-240bpm Can only be used as an auxiliary tool for sports use Support 5.3kHz emission same time， the effective receiving distance is 70m， can be connected with receiving apparatus which with 5.3KHz，such as: heart rate watches， treadmills Used to record the heartbeat and transmit the data to the watch or intelligent mobile phone Compatible with iPhone 4s/iPhone 5/iPhone 5s/iPhone 6/iPad 4/iPad mini/iPod touch 5 General Specs Brand & Model Atongm Polar H7  Type Heart Rate Sensor Bluetooth V4.0 Heart Rate Detection Range 40-240bpm Test Heart Rate Range  40-240bpm ± 1bpm Battery Life 12 months(one hour a day) Compatibility iPhone 4s/iPhone 5/iPhone 5s/iPhone 6/iPad 4/iPad mini/iPod touch 5 Package Details Weight: 94.16 g Size: 18*6.3*6.3 cm Package Includes 1 x Heart rate transmitter，1 x Adjustable elastic belt，1 x User manual，1 x Battey(already installed)