Microchip's 16-bit PIC24 “Lite” microcontroller (MCU) family combines eXtreme low power (XLP) technology, low price and low pin count packages for the most cost-sensitive consumer, medical, and safety/security applications. Comprised of the PIC24F “KL” and “KA” series, the family features typical sleep currents down to 20 nA at 25°C, and typical run currents as low as 150 µA / MHz at 1.8 V. PIC24F16KL datasheet  PIC24F16KA datasheet

The Microstick for the 3 V PIC24F K-series is an easy-to-use development platform featuring everything designers need to get started with PIC24F “KL” MCUs, including an on-board debugger / programmer and device-under-test (DUT) socket for easy device swapping. At about half the size of a credit card, it is extremely portable and can be plugged into a prototyping board.