Specs on the PIC microchip on the circuit board
http://www.chipcatalog.com/Microchip/PIC16LF87-I-P.htm
This powerful (200 nanosecond instruction execution) yet easy-to-program (only 35 single word instructions) CMOS Flash-based 8-bit microcontroller packs Microchip’s powerful PIC® architecture into an 18-pin package and is upwards compatible with the PIC16C7x, PIC16C62xA, PIC16C5X and PIC12CXXX devices. The PIC16F87 features 8MHz internal oscillator, 256 bytes of EEPROM data memory, a capture/compare/PWM, an Addressable USART and 2 Comparators that make it ideal for advantage analog / integrated level applications in automotive, industrial, appliances and consumer applications.