Specifications include, but are not limited to: The latching button shall: 3.1. Be Polara Bulldog brand or a buyer approved equal 3.2. Be highly vandal resistant and pressure activated with essentially no moving parts. 3.3. Have a cap made of 316 stainless steel. 3.4. Have a switch of solid state Piezo electronic switch rated for 100 million cycles with no moving plunger or moving electrical contacts. 3.5. Activate with 3 lbs of force or less. 3.6. Have an LED that latches βONβ when wired to the control module to give an indication of the button being pushed. Once the push button is pushed, the LED indication shall latch on until the next walk cycle goes into effect. 3.7. Emit a two toned beep indication of button being pushed whenever the button is pushed regardless if the unit is wired to the control module or wired to the DC isolator (one tone for push, one tone for release). 3.7.1. The ports on the housing for emitting the tone shall be waterproof. 3.8. Have a built in surge protection device. 3.9. Be able to hold the call for a minimum of 5 seconds.