LED INDICATOR: HS500 integrated with a LED indicator light so that you can know the working status easily.HOW TO CONNECT: 1.Turn on the bluetooh on your phone. Tips:Don't searching sensors through the phone system's Bluetooth settings. 2. Click the App to connect sensors. Tips:After wearing the device,Connect to the device via Phone APP/ Bike Computer. 3.Check the App displays the data normally.How To Wear: 1.Moisten the electrode areas of the HR strap. 2.Align the HR Module with the chest strap. 3.Adjust the strap to fix tightly to body. 4.Keep the sensor electrode area close to the skin and the sensor in the center.colour: blackMaterial: plasticPackage Contents:1 x Heart rate sebsor(With battery)1 x Adjustable elastics strapOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.