Wireless transmission: Bluetooth 4.0 + 2.4Ghz ANT+ Wireless communication protocol. Standard Accessories: HR35, Chest bel t, CR2032 button battery,User's Guide. HR35 Dual Band Heart Rate Montor. Adjust the length of the chest strap so that the chest strap can be fastened just below the chest muscle.Make sure that the wet electrode area is close to the skin.Note that the distinction between left and right (L for the left, R for the right).
