Ajax 38100.21.BL1 is a wireless magnetic contact for doors and windows that also incorporates shock and tilt detection and an external input for third-party sensors. It communicates with the Ajax hub via bidirectional 868 MHz Jeweller radio and is supplied with a miniature magnet in a black finish. Typical use is perimeter and opening detection in intrusion alarm systems certified to EN 50131 Grade 2. Country of origin: Ukraine.