The lock is USB rechargeable, with a max time of 99 hours. That is over four days of being trapped or restrained, with no hope of escape except to wait out your time until the countdown is finished.
When the timer has finally run down, a tone sounds, signaling your release. The interface is easy to use and instructions are included. Just make sure the lock is fully charged and structurally sound prior to securing it- once it is on, there is no escape!
Measurements: 1.5 inches in length, 1.75 inches in length. Locking bracket is .1 inch thick.
Material: ABS plastic, metal.
Note: Charges via USB. Includes lock, charger, and instructions only.