The custom detection timer is a countdown timer that is designed to track time while detecting the presence of a nearby object. It features 5-minute and 10-minute settings, with the remaining time displayed on an LCD. The system uses a VL53L0X time-of-flight distance sensor to detect an arbitrary object. When an object is placed near the timer, the countdown stops, and a 440 Hz alarm sounds. The timer is powered by an ESP32 microcontroller, which manages the countdown, object detection, and user interface. A 3D-printed enclosure houses the components, ensuring safety and usability. The system includes dimmable timer lights with three brightness levels and a power disconnect switch. All components are rated at least IP40 for safety. User-friendly design ensures at least 9/10 users can operate it without instructions. The timer system prioritizes accuracy and safety while providing an audible alert when the object is placed.