Easy to use and great looking too. The control / display head is about the size of a marking pen The joystick control button allows easy navigation through all of the different menus.

The new timer can automatically determine the necessary amount of after idling time by calculating how hard you have been driving. A Manual Mode allows the user to preset desired idling times from 0 sec.~10 minutes. By inputting O2 sensor voltage, the timer can also display theoretical air fuel ratio. The timer can also display critical data such as O2 sensor voltage and battery voltage. The handbrake safety feature shuts off the vehicle when the handbrake is released without the ignition key.

This APEXi Auto Timer (Black) - Red LED part or APEXi Auto Timer (Black) - Red LED accessory is about 500 gram.