The A'pexi auto timer features a compact interface design (4 x 3/4 x 5/8 inches) with a separate control unit that can be hidden away underneath the dash. The Auto Timer is also the first timer with an integrated air-fuel ratio monitor. The unit reads O2 sensor signal from the ECU and extrapolates and air-fuel ratio value. The Auto Timer can detect the engine load before shutdown and adjusts the idle time accordingly. Finally, the Auto Timer has a safety/security feature that immediately shuts down the engine when the parking brake is released.

In Japan, the Auto Timer is frequently used in normally-aspirated cars. Like turbo engines, normally aspirated engines can benefit from cool-down idling after a hard run. Many have also found it useful for keeping the A/C running on a hot day.

Please note: HKS turbo timer harnesses may be used instead of A'PEXi harness as they are compatible.