The Whoop 4.0 Device Only with Band is a fitness activity tracker designed for unisex adults. It features a high-resolution display and a variety of measurement systems, including heart rate monitoring. With a battery life of up to 5 days, this device is equipped with Bluetooth connectivity and optical bio-tracking sensors for accurate tracking. Suitable for running and jogging activities, the Whoop 4.0 is a reliable tool for tracking fitness goals in English-language settings.