The RANGER series mini-boom headsets use an innovate over-the-ear design that keeps the headset in place. The earloop adjusts to comfortably fit either the right or left ear. The SPM-400A series is perfect for many different medium-duty uses, including retail stores, bicycle mobile operation, security, business and industrial, and more. The unit features an in-line Push-To-Talk switch that can be clipped to the user's lapel or belt, or the unit can be keyed remotely using an optional remote PTT.