The LED interval timer can be connected with mobile app to control via BT. You can not only use the simple features like countdown, count up, stopwatch, Tabata, FGB, but also you can program your favorite interval timing for your own. Convenient USB charging allows you to carry and use it anytime, anywhere. Features: Support 12/24-hour clock, stopwatch, countdown, count up and custom interval mode. Timer has pre-programmed buttons include MIIT, HIIT, TABATA, EMOM and FGB, great for workout time management. You can control it on your smartphone via BT. With ultra bright LED display and buzzer remind, allows you to get the time easily and clearly. 3-level brightness suit for different occasions. Magnetic backing, you can attach it to the fridge or any metal surface to leave your hands-free. Measures 6.1 x 2.0 x 0.9'', small and lightweight, convenient to carry around. Built-in 1800mAh rechargeable battery, working 10 hours after 2 hours full charging. Applicable places: bedroom, living room, office, classroom, gym and other indoor places. Function: 1.Clock: [H1 HH:MM] / [H2 HH:MM] (H1:24-hour/H2:12-hour) 2.MIIT: 1 min for exercising, 1min for rest, in groups of 99 3.HIIT: 30s for exercising, 30s for rest, in groups of 99 4.TABATA: 20s for exercising, 10s for rest, in groups of 8 5.EMOM1: 5 min for exercising, 1min for rest, in groups of 5 6.EMOM2: 5 min for exercising, 1min for rest, in groups of 3 7.FGB 1: 1 min for exercising, no rest, in groups of 17 8.FGB2: 1.5min for exercising, 1min for rest, in groups of 17 9.WRC: 10 groups of customized program 10.Up: [ up 00:00 ] ~ [ up 99:59 ] (up mm:ss) 11.Down: [ dn 99:59 ] ~ [ 00:00 ] (dn mm:ss) 12.Stopwatch: [ 00:00:00 ] ~ [99:59:99] (MM:SS:ss) Specifications: Material: ABS Color: Blue & red / Green & white ( optional ) Battery Capacity: 1800mAh Charging Time: 2H Charging Current: 450mA Charging Voltage: 5V Working Current: 180mA Product size: 156 * 52 * 24 mm / 6.1 * 2.0 * 0.9 in Digit Length: 25.4 mm / 1 in Packing Size: 180 * 75 * 53 mm / 7.1 * 3.0 * 2.1 in Packing Weight: 350 g / 12.3 oz Package List: 1 * Timer 1 * Type C Charging Cable 1 * Manual