Magnetic recessed contact / Long-life battery 3-5 years
-Recessed mounting for concealed protection. -Includes easy-to-replace AAA lithium battery. -Transmitter: 7.6 cm. (Length) x 1.9 cm. (Diameter). -Magnet: 1.2 cm. (Length) x 0.9 cm. (Diameter). -Long Battery Life 3-5 years
