The 4 EVR “Chameleon” has solid-state piezo technology which gives it the ability to extend the closure to a consistent time slice, and guarantee a momentary closure as the call is terminated after approximately six seconds. Pedestrian actuation feedback is provided with each actuation in the form of a momentary LED flash and a harmonic audible tone (dee da tone).
Sold separately, the Campbell Company manufactures button cups for round and rectangular push buttons. These button cups are machined from solid stock and provide service entry from both back and bottom. Each button cup is supplied with a removable chase nipple and plug.