Bluetooth 4.0 Shield for Arduino
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Brings the latest Bluetooth 4.0 BLE (Bluetooth Low Energy) to Arduino. The peak energy consumption is just half of the traditional Bluetooth devices. A single button battery (such as 3V 220mAh CR2032) on a Bluetooth 4.0 single mode chip could work for months or years. Startup time is only a few milliseconds compared to about 4 seconds on the Bluetooth 2.1.