Featuring Bluetooth® SIG certification, MK71050-03 integrates LAPIS Semiconductor's ML7105 wireless communication IC with 16 kB EEPROM, 26 MHz XO for master clock, and pattern antenna. Connection with host MCU is made via SPI, while commands and data format unique to LAPIS Semiconductor are implemented using 3 dedicated terminals: IRQ pin, WAKEUP pin, RF Active pin. Design has FCC certification in USA, construction design certification in Japan, and European compliance with R&TTE Directive.