The Garmin vívofit 4 Activity Tracker in black, size S/M, offers a 1-year battery life and Bluetooth ANT+ connectivity. This unisex fitness tracker provides detailed measurements such as steps, sleep, time, distance, and calories. With a sleek design and comfortable silicone material for the wrist, it is perfect for indoor and outdoor activities. The device is compatible with both iOS and Android operating systems, and comes with a 1-year manufacturer warranty. Additionally, the tracker features an accelerometer sensor for accurate tracking and a display resolution of 88 x 88.