Wio Extension Real Time Clock Seeed Studio Wio Extension Real Time Clock (RTC) powers the Wio LTE open-source gateway, enabling faster Internet of Things GPS solutions. Seeed Studio Wio LTE devices are found in time-keeping applications, battery-powered devices, and metering. A Micro USB port powers the board and communicates with the Wio LTE via an I2C port. The board is based on the NXP PCF8523 semiconductor chip, which can provide information on year, month, day, weekday, hours, minutes, and seconds.