Here is another affordable gadget that helps you monitor your heart rate on the go. The JaneDream A88+ connects to your iOS and Android devices. It has a 0.66″ OLED display and 100 mAh battery. Its battery lasts up to 4 hours. The device alerts you when you have been sitting for too long. It also counts your steps. The A88+ is available in Black, White, Purple, and a few other colors.