433 MHz universal radio transmitter that can be used as a mini-magnetic door, mini-window contact (maximum separation of the magnet of 1.6 cm) or as a transmitter of a series of contacts, in this case not to exceed 40 cm cable or that the resistance of this cable is greater than 100 Ohms. EN50131, Grade 2 and Class II certified. Fully supervised: Tamper, fault, low battery. Supplied with pre-installed lithium battery. Quick installation with heavy duty double sided tape. It can also be screwed on. It works with a lithium battery, type CR2 of 3V, supplied. Battery life 5/8 years. Dimensions 73 x 30 x 22 mm.