Special device : inner-placed wave receptor . Detect :  door detected signal output (selected).
Security type: the application scope of the switch : wooden door, glass door, metal door , fireproof door.
Close with power on, open with power off. Remove the remains automatically, low noise , and againt the wind pressure.
Size : length 250 x width42 x height25(mm).
Work current: 12v/480mA: 24v/240mA .
Input voltage : 12v or 24v . 
Affordable Tension: 280kg(600Lbs).
The specifications of all the products should take the actual products as standards. Due to the update of the technology , we cannot promise all the actual products are the same as shown in this material. For detail technical parameters , please reed the instructions enclosed with the products .