Key Benefits WHOOP 4.0 compatible Waterproof design (IP68) Designed with your goals in mind, this innovative accessory empowers you to stay charged throughout your day, wherever it may lead you. The waterproof feature of the battery pack ensures durability and reliability without compromising performance. It allows you to wear it in a variety of conditions, for example, while you're sweating it out in a rigorous workout or even just walking in the rain. Experience the freedom of continuous data collection for days on a single charge, providing you with valuable insights into your body's metrics and helping you make informed decisions about your health. With the convenience of on-the-go charging, simply slide the battery pack onto your WHOOP 4.0 device, ensuring that you stay connected and informed. For added convenience, recharging is easy - just use the included USB cable to easily recharge your battery pack from a laptop. The IP68 design is dust-proof and water-resistant up to 1 meter for 2 hours. So you know you are only getting the best.