If you're looking for a budget buy, this is it. The CooSpo IP67 chest strap uses ANT+ technology and Bluetooth, which allows it to sync and work wirelessly with probably any device you already have. Coming in at just $30, buyers love the value for the price. "Great alternative to name brand units for less money," and "Great price and will easily pair with all popular devices and products. Strap feels comfortable and transmission is very accurate."