The PHD ULTRA™ Satellite Pumps are infusion/withdrawal pumps. They are available in three configurations: standard, push/pull and high force (PHD ULTRA™ 4400 Satellite). The Satellite Pumps are combined with stand alone PHD ULTRA™ Pumps to create a Gradient System. Satellite Pumps can only be powered from a stand alone PHD ULTRA™ via RS‐485. They cannot be controlled with a PC (Please see our PHD ULTRA OEM pumps for PC controlled modules). Satellite Pumps include a footswitch input, USB and RS‐485 connectors.