Product size:29cm W x 10cm H x 4cm D / 11.4''W x 4'' H x 1.5'' DButton diameter: 2.4inch, button base size: 3x2.5inch Power supply: AC/DC adapter, transformer supports: 100-240V, 50/60Hz Operation voltage: 5V, 2A Non-waterproof What's the Main Functions? Green button: start stopwatch Red button: stop the stopwatch White button: reset the stopwatch to zero Similarly, the remote controller can control the timer to return to zero: Upgraded to connect with a 2.4inch diameter button, the stopwatch can be stopped by the button-reset to zero-start in time It's Clever, It's not only a Digital Clock, it can display time, countdown, count-up and stopwatch, the format [HH:MM:SS] Made by LED, no heat generated, energy saving environmental protection, soft light dimmable Black Aluminum frame, flat bottom with 45 degree incline, include metal brackets, practical design fits anywhere 10" screen and 1.5" height digit, red color, frosted clear front design makes soft light non dazzling 10-level brightness adjustable, easy to read in daylight & the dark, just press the up and down button to adjust the brightness to the way you like Safety 5V operation voltage Press ALIGAN to switch the mute & prompt tone, press SHIFT if you don't want alarm when countdown or count-up to the end CR2025 button cell for remote controller, with memory function, no need to reset time after power renew. Features: Display the timer what you like, easy to program just use the remote controller The clock can place on table or hung on the wall as well The digital clock has 12/24 hour modes Time display: HH:MM:SS With alarm function and prompt tone, press ALIGN to remove prompt tone, press SHIFT to cancel alarm Advantage than traditional clocks, the new type clock with red digital LED, up to 50 feet long-distance readable, 10-level brightness adjustable SPEC.: You'll receive: 1x Digital Clock Display 1x button box 1x AC Adapter with 4 feet long power cord 2x Metal brackets 1x Remoter 1x Manual Important Cautions: The controller does NOT have AAA battery, because battery is NOT accepted by Air courier, thanks for your kind understanding.