Point Six, Inc.'s (Lexington, KY) line of WOW(tm) sensors can be customized to fit individual needs. They are battery operated with a microprocessor-controlled, 418-MHz, FCC-certified radio transmitter in a small ABS enclosure. Other features include onboard time- of-day clocks, a CRC-16 error check, and a short data packet that results in a transmission of 15 milliseconds.