This module kit senses the presence of an approaching body at a distance of 10 to 80cm (depending on the size of the body), and lights an LED. * Uses include: parking assistance for cars and alarm sensors * The device uses the same principle as the ultrasonic echo ranging of bats * Kemo type B214 Requires assembly. This kit may be extended to relay operation with relay board 70-1404 (not included). https://elecena.pl/product/27884824/kemo-b214-ultrasonic-proximity-sensor-kit 2025-02-20 https://elecena.pl/product/27884824/kemo-b214-ultrasonic-proximity-sensor-kit 2026-05-03