Replacement RTC chip for the SE30. This RTC is a ATTiny85 on a PCB with its own crystal for better accuracy on the SE30. No battery is needed when using this RTC version as the P/RAM settings are stored in the flash RAM. The external crystal on the logic board is not needed either. Please NOTE the selection for Europe OR USA/Other parts of the world when purchasing this item. Our Europe team member has them available from Sweden and the prices are adjusted to equal the EU$ amount. DO NOT BUY THE EU VERSION IF YOU LIVE IN USA/CANADA/OTHER.