This is a Hewlett Packard model M1008B non-invasive blood pressure module. This unit is in very good cosmetic and operating condition. This module will work in Hewlett Packard Merlin, Omnicare, Viridia, and other monitors, as well as many Agilent and Philips monitors. We have approximately 25 of these modules in stock. Each comes with a 30 day warranty. Money back guarantee if dissatisfied upon receipt.