The range between two Zigbee devices is

• European market: 40m in open field
• United states and Australian market: 80m in open field

However, this range will vary depending on the radio environment in which the Zigbee system is installed.

Many environmental factors can affect signals, including the following:

• Building materials such as steel and concrete
• Lots of other radio controled products
• Installation near a hospital or airport
• Accessibility to the motor antenna
• Areas with many WiFi networks in close proximity

Consider that in a house, the Zigbee network just allow to go in the next room (Cross one concrete wall).

With TaHoma switch solution, the range is extended with the Mesh network by adding routers.