When we shop electronics, we are prone to choosing smart devices that support wireless technology, and can be easily controlled or accessed by smartphone. Nowadays more and more devices begin to use the wireless protocols to communicate each other, compared with hardwired communication, the wireless can provide many advantages, it seems the weakness of today's wireless technology has been resolved almost completely. Many companies have to decide which protocol to use for their new smart devices at the beginning of product design, is WiFi or ZigBee, or the Bluetooth Low Energy (BLE)? Some even consider to use their own private technology or the conventional 433/868MHz RF protocol. Companies take many factors into account including cost, power consumption, wireless range and interoperability and more.