Note:Battery is CR1220 3V,we ship without battery! Hope you can understand. Here's a handy a compatible with rduino shield: we've had a lot of people looking compatible with a dedicated and well-designed data logging shield. We worked hard to design an inexpensive, yet sophisticated design. Not only is it easy to assemble and customize, also equipped with extensive documentation and libraries. You can get fast - to save the data to a file in any FAT16 or FAT32 compatible withmatted SD card, you can read any drawing, spreadsheet or analysis program. We even have an example of how to use two free software programs to plot your data tutorials Including real-time clock with the current time stamp compatible with all the data so that you know exactly what happened when! Please note that this item does not come with an a compatible with rduino (you need to use the shield), or SD card. It does have the RTC battery, however. Now, the geology of fire to all components of the welding and testing, but not installed head. You need some basic soldering skills to put it together, but even if you do not have much experience, you can get it within 15 minutes to complete SD card interface with FAT16 or FAT32 compatible withmatted card. 3.3V level shifter circuit to prevent damage to your SD card Real-time clock (RTC) to maintain the time, even when the a compatible with rduino is unplugged. Backup battery lasted compatible with many years Including SD card and RTC libraries and sample code means you can get fast Welded joints, circuits or sensors prototyping area. Built-in 3.3V regulator is a reliable reference voltage, and a reliable operation, requires a lot of power to run the SD card Compatible with a compatible with Arduino UNO, compatible with Duemilanove, compatible with Diecimila, compatible with Leonardo or compatible with ADK / compatible with Mega R3 or compatible with higher. compatible with ADK / compatible with MEGA R2 or lower is not supported. Color: As Shown Material: PCB Package Contents: 1 * Module Only the above package content, other products are not included. Note: