If you purchased our Netbell-K, Netbell-K-M2, Netbell-KB, Netbell-KB-M2, Netbell-KL, Netbell-KL-M2, Netbell-KMB, Netbell-4K and want to add a push switch to the controller to manual activate the bell/buzzer for emergency, his cable is good for you to connect the push switch to the controller.
