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Specification -High sensitive sensor device -Heart Rate Range -Strap length:65-95cm -Maximum wearing size: 120cm -Weight: About 55g -Physical dimension : 59*35*12mm -Waterproof: IPX7 -Battery: about 340 hours -Wireless transmission: Bluebooth & ANT+ Compatible devices -iPhone 4S and above, iOS 8.0 and above; Android 4.4 and above -iPod touch 5 iPad 3/4/Air/mini -Samsung Galaxy s4/5/6/Not3 -Coogle Nexus 4/5/6/Android 4.3 -Cycling computer devices support ANT+,such as Garmin,Polar,Bryton and more -BLE devices Garmin Watch(Support ANT+) Package include -HR40 *1 -Chest Strap *1 -CR2032 button battery *1 -User Manual *1