Specifications : Name : Electronic Time Lock Box Material : ABS Color : white, black, blue Size : about 16.5 x 14.5cm/6.50 x 5.71in Power supply : 2 AAA batteries (not included) Please set a reasoble time : The longest setting time : 999 hours 59 minutes 59 seconds, the shortest 1 minute, the box will automatically open when the set time is reached. Packing List : 1Timer Box (without battery) 1Cable 1Instructions Notes : If the battery is not installed or dead, after locking, please connect the charging cable immediately. When the screen is on, press the H and M buttons at the same time to unlock successfully.