The MZ-3 Heart Rate Monitor is a well-crafted piece of technology with multi-functional features that helps you to track your workouts, stay motivated, and set goals to get the maximum result from the effort you put in. The MZ-3 is the most versatile heart rate monitor strap with 99.4%. Benefits Connectivity: Connects with gym equipment (Ant+), in-club display screens, and the Myzone App. Sync with Myzone App: Download the Myzone app to get live results whilst you workout when you are not in a club setting. Myzone Social Network: Achieve your health and fitness goals with motivational support from friends through a Myzone social network and use Myzone Effort Points (MEPs) to give yourself motivation. Washable: The MZ-3 comes with a washable strap so you can also stay fresh and sweat-free. Sweatproof: The MZ-3 is waterproof up to 10 meters. It is also sweat-resistant. Rechargeable battery: The MZ-3 comes ready charged, it should only be when the battery is running low using the Myzone charging cable via a computer. The battery can last up to 6 months on one charge. Built-in Memory: Wherever and however you choose to train, the MZ-3’s built-in memory allows you to make every session count even when you’re training away from your gym and it’s not convenient to carry your smartphone. What's included MZ-3 module Adjustable comfort strap (Size Standard) USB charger cable Getting started guide Chest Strap Sizes Child: 35cm (13.8") to 60cm (23.6") chest Small: 54cm (21.25") to 70cm (27.5") chest Standard: 62cm (24.4") to 88cm (34.8") chest Large: 70cm (27.6") to 103cm (40.6") chest Replacement Chest Straps & Cables Myzone Replacement Chest Strap for MZ-1 and MZ-3 MZ-3 USB Cable Charger