With the SmartSlot Expansion Chassis you can integrate SmartSlot accesories with your Smart-UPS or Matrix-UPS even if the UPS is not SmartSlot equipped, or use multiple SmartSlot Accesories with a single UPS. Attach the SmartSlot Expansion Chassis to your UPS serial port and place a SmartSlot Accesory into the Expansion Chassis to customize the UPS to your specific application. Two SmartSlot Expansion Chassis can be daisy-chained together, enabling the use of up to three SmartSlot accesories from one UPS.