Usage Tips:[Multi-function Interval Timer ]The countdown timer has 5 different modes (Normal time mode, countdown mode, Count-up mode, stopwatch mode,interval mode). [Visible LED GymTimer] With the LED display and loud buzzer of the interval timer,clear LED and high contrast display allows you to see the bright LED numbers from all corners of your gym or home. The numbers are brightly displayed and the alarm is loud enough to hear but not too loud.Timer be beep 3 times when time counts down 3 seconds [Pre-programmed Timer]- This timer comes preprogrammed timer settings. button: store 20seconds work time and rest time, Repeat 8 times; FGB1 : Store 5 minutes train time, 1 minute rest time, repeat 5 rounds; FGB2 button: Store 5 minutes workout time, 1 minute rest time, repeat 3 time.There be 10s preparation time at each start [Customizable interval timer]- you can program and store your workouts with the amount of work time versus rest time with numbers of rounds. It also can do a lot of HIIT training and so it helps to program 1 min on/1 min off workouts. Beep every interval time and ability to set 10 seconds prepare time. Perfect for training /rest/cycle [Important Tips]You can change the brightness (5 levels) through the remote control.This product is A/c outlet powered not a battery powered timer. And you can power by your powerbank via USB cable.The remote is only way to control the timer.Remote control's battery: 2XAAA (Not included) Colour:Black Material:ABS Size:27x8.8x3cm Package Contents: 1 * gym clock timer 1 * Remote 1 * usb cable 1Set * installation accessories Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.