Specification： *Once the time run out, the padlock will unlock automatically. *Great for correcting those delay patients who lack self control. Material: Zinc alloy Color: silver，black Size: 11.5cm*8.5cm*3cm/4.5in*3.3in*1.2in Weight: 110g/0.24lb Package Included: 1*Timing Padlock 1*Use Manual 1*USB Charging Cable Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Thanks for your understanding! *Durable: Heavy duty metal body with smooth edges, splash-proofed, safely use in outdoor. *LCD Display: With whit backlight, easy to read. *Unique Design: Built-in smart chip and digital timer switch, automatic unlock, free from keys. *When the time count down to zero, It will annoy alarming to remind you of resetting or not. *USB rechargeable, over 500 hours long standby.