The Shannon SPA (Sip and Puff Alternative) is an alternative for the widely used sip and puff switches. The SPA system comprises a Main Switch Unit and a Sensor of choice. With the sensor, two independent configurable switch functions can be controlled. The Main Switch Unit comes with rechargeable batteries, a USB cable and a USB stick with the full manual and special Windows software for adjusting the Unit and the Sensor.

Several types of Sensors are available. Every Sensor has an indicator light to show that the power supply is OK. If external USB power is available, the light is constantly On. When the device is operating on batteries, the light will blink.