With Bluetooth organization for the release of the Bluetooth 4.0 BLE, low-power wireless technology products has been stepped. Bluetooth wireless technology is using one of a wide range of global short distance wireless standards, new Bluetooth version 4.0 will be three kinds of Bluetooth Technology (i.e. traditional Bluetooth, Bluetooth high speed and low power Bluetooth technology and oneness. It inherits the Bluetooth technology in the wireless connection inherent advantages, while increasing the characteristics of high speed Bluetooth and Bluetooth low energy. These three specifications can be used in combination can also be used alone.

   The core of Bluetooth 4.0 specification is low power technology (Energy Low), that is, the Bluetooth 4.0BLE. technology is characterized by ultra low power consumption and standby power consumption, Bluetooth low power devices use a button battery can work continuously for several years, can be applied to the cost and power consumption are strict requirements of wireless solutions, widely used in medical care, sports fitness, smart home, sensor networking and other fields.
   System based on Center (central equipment) and Peripheral (outside) to connect, data communications.BLE connection process by Peripheral to send data to let any Center know it is a connected device. Data content contains device address, but also contains a number of additional data, such as the device name, service ID and so on.
   Center receives data from the Peripheral and sends the request to the Peripheral, Center returns the scan response to the Center, so that Center knows that this is a device that can connect to.Center can send a request data to the Peripheral to connect to the Peripheral, but also can bind operation.Bluetooth 4.0 ble technology using three channel broadcast channel, the millisecond time allows fast connection setup, efficiency is much higher than that of conventional Bluetooth 32 channel. Traditional Bluetooth has 79 data channels and channel spacing is 1MHz; Low Power Bluetooth technology design only 40 number according to the channel, the channel spacing is traditional Bluetooth. The peak current is generally 35mA and sleep current is 0.01mA. and low energy Bluetooth work peak current is less than 20mA, and sleep current is 0.004mA.