Seeeduino Stalker is an extensive Wireless Sensor Network node, with native data logging features and considered modular structure. It could be conveniently used as sensor hub or integrated data collector for monitoring, tracking and etc.Features:Arduino compatible, based on Seeeduino Native RTC, On board CR2032 battery holderNative micro SD card socket Easy stackable I2C pin headerDual voltage (5V/3.3V) I2C hub Standalone and shield mode User defined button and LED B” series socket (2*10 pin 2.0mm pitch, same as Xbee) Interrupt evoking ready Serial interface with DTR for auto reset during programmingDocumentsPlease visit our wiki page for more info about this product. It will be appreciated if you can help us improve the documents, add more demo code or tutorials. For technical support, please post your questions to our forum.