Replacement battery fits 5 Micro Medical compatible models. Specifications: 1200mAh, 7.2V, Ni-MH. Compatible with: CDX Spiro 850, MicroLab 2002 Spirometer, Microlab 3500 pulmonary function testertype MK4, Microlab MK4 3000 Spirometer, MC3500. Replaces: Micro Medical MLA5009, Micro Medical B11554, Micro Medical 69100700. Micro Medical replacement battery designed for Medical devices.