uCXpresso LilyPad for nano51822 (BT4.0/4.1 Arduino iBeacon Sensor) ARM Cortex M0 32 bit/ 152kb embedded flash/ 6kb RAM memory Diameter 39.37mm (15.50") x 1.0mm breakout lilypad board Dual Transmission Mode of BLE & RF 2.4G upon customer preference. Tickless Low Power Technology Ready Long Working Distance (Over 80M in open space)