Features: brand new and high quality The Killper firmware can use the ADXL345 accelerometer, which can be used to measure the resonance frequencies of the different of the printer and automatically adjust the input shapers to compensates for the resonance.This accelerometer help provide print quality. ADXL345 connects to for RaspberryPi or MCU We have designed 5V power supply that is more suitable for most motherboards. It can be directly installed on the 36 stepper motor, which is convenient to fix. Made of high-quality materials, exquisite workmanship, very good quality and long service life. Specifications: Material:PCB Power:5V Size:Approx.50.17x34.16mm/1.98x1.34inches Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x ADXL345 Accelerometer Board