APC SMX120RMBP2U Smart-UPS X External Battery Pack Rack Tower 2U...The APC SMX120RMBP2U Smart-UPS X External Battery Pack Rack Tower 2U is a high-quality battery pack designed by APC for use with uninterruptible power supplies. This external battery pack is compatible with the Smart-UPS X series and offers reliable power protection for computers, tablets, and networking equipment. The sleek black color and tower design make it a stylish and functional addition to any data center or server room. With the model number SMX120RMBP2U, this battery pack ensures that your critical systems stay up and running during power outages or fluctuations.