You can use as many Cuebi Lights as your setup requires.

The Cuebi Lights connect over WiFi, so you need a wireless access point connected to the switcher network. Connect each Cuebi Light to your computer via USB to set up network credentials, IP addresses and camera input number.
Attach it to a camera and power it up by connecting it to the provided battery pack or any other USB power supply.
Within 10 seconds the Cuebi Light is started and connects to the switcher. It will show a red light for program and a green light for preview.

All you need is a decent wireless access point to set up a stable 2.4Ghz b/g/n WiFi network, connected to your switcher. You also need some AA batteries, or a USB power source for each Cuebi Light.

It is safe to update your switcher without breaking the Cuebi Light, the firmware can easily be updated through the setup utility.

The range largely depends on the strength of wireless access point and any physical obstructions present, but is similar to other devices connected to the same network like phones and tablets. If required, the range can easily extended by adding more access points to the network.

We wanted the Cuebi Lights to be as small and light as possible, so it can be placed anywhere you like, viewfinder, LCD monitor, etc., without limiting your movement. It also gives you the freedom to select the most optimal power source for your setup. Many camera's have some form of power output, like a USB port or a d-tap connector, that can be used to power the Cuebi Light.