Lendoo I5 Plus Smart Bracelet Fitness Tracker Sport Wrist Bluetooth 4.0 Pedometer Tracking Calorie Health Sleep Monitor Wristband for Android IOS Phones (deep blue) Almighty FunctionsSteps Counting, Mobile Anti-lost, Camera Remote Control, Sedentary Reminder, SMS Reminding, Call Reminder, Incoming Calls Show, Calories Burned Measuring, Sleep Management, APP Message Reminder (Like Facebook, Twitter, etc). Waterproof DesignIP65 Living Waterproof Design, No Need to Remove Even When You Wash Hands. (Please Take Off When You Diving and Swimming). Smart Technology0.91" OLED Touch Screen with Gesture Senser Control, the Screen Will Automatically Light up When You Turn Over Hand, Act as Traditional Watch. Easy CompairingRequired Bluetooth Version 4.0 and Above, Fit for Smartphones Over Android 4.3 Version and IOS 8.0 Version. Use Together with APP "ZERONER" or "ZERONER HEALTH". Comfortable WearingAdjustable Silicon Band Fit (5.5" - 7.6") for Different Wrist Size, 25g Light Weight Makes You Feel Free. /b&gt; Note: the step counting functions works on the vibration and gyro senser dectation, slight movement can not be detected, and data updating in about every 8 seconds, not real time. so, data is not 100% accurate Certain Common Defect Complaints,a nd their Troubleshooting steps: 1, "Could not get it to restart each day." A: please check the devices and app fullfil the conditions required, especially update the hardware version to 2.1.1.7. as we tested many devices, we did not find this issue on others. we can offer a new replacement if the update can not fix it. 2, "I bought this specific band because it advertised "Anti-lost -------It gives you alarm when the distance between your phone and bracelet out of the range". This is not the case." A: this Anti-Lost functions, not works as other anti-lost key finder, when the device get out of the range, ring will sound. this Anti-Lost means, under the condition that the bracelet keep connected to the phone, and within the range, but you can not find your phone, then you can click "Find Phone" function button on the bracelet, at the same time, the phone will sound the ring. we have updated the description long time ago, buyer may not see it. 3, "it is not working correctly, tried numerous times. does not track all my steps." A: tip (1), make sure the connection is correct, and your phone fullfil the condition that ios over 8.0, android over 4.3, app version 2.1.1.7. tip (2), if connection is ok, please clean the data, uninstall the old app and get new one, reconnect and try. tip (3), the step counting function works on the distance and vibration detection, so, little movement may not be counted by the device, so, the data is not 100% precise as your real movement.