💓Polar H10 Heart Rate Sensor ٨ـ💔 🏃‍♂️🧗‍♂️🏃‍♀️🎁 💓Comfortable-to-wear Polar Pro chest strap is made with a soft textile material with slip-preventing silicone dots and a secure buckle Compatible with top fitness apps, sports and smart watches, gym equipment and many other Bluetooth and ANT+ devices Supports simultaneous ANT+ and Bluetooth connections; can be connected with 2 Bluetooth training devices at the same time Works with iOS mobile devices iPhone 5 or later and Android devices with Bluetooth 4.0 capability and Android 4.4 or later Internal memory lets you store 1 training session to download later, letting you leave your wrist unit or phone behind; data can be transfered to the free Polar Beat app Suitable for swimming, thanks to 30m water-resistance and 5 kHz transmission that works under water Transmission range of 30 meters Provides up to 400 hours of operation on a user-replaceable CR 2025 battery Regular over-the-air firmware updates enhance functionality over time, without the hassle of cables; updates via mobile phone using the Polar Beat or Polar Flow app Chest strap fits 25.6–36.6 in. (65–93 cm)