BOSCH, Radion Series, Wireless reed switch, For doors/windows, Flush mount (recessed), Suits RFRC-STR2, RF3212E, B810 & RF120 receivers, 433MHz

Self-contained transmitter w/ magnetic reed switch contact. Concealed, recessed mounting in doors/windows for unobtrusive security. Up to 5yrs operation via 1x user replaceable AAA Lithium battery. Supervised for low-battery & cover tamper conditions