Steinel 055622 HF 3360-Square LiveLi motion detector

Nothing can stop it. High frequency motion detector HF 3360, ideal for basements, stairwells, parking garages, installation height 2.8 m, 360° detection, range 18 m (radial), temperature-independent detection, HF sensor technology also penetrates glass, wood and lightweight walls. Available in round and square surface-mounted and flush-mounted versions.