Key Benefits: Prevents food stealing and stress at mealtimes in multi-pet homes, keeps your pets healthier by controlling portions and helping to keep weight under control, saves money by not overfeeding expensive prescription foods and helping to avoid vet bills related to pet health conditions. Great for Pets on Prescription Diets: Holds 13.5 fl. Oz, wet or dry pet food. The lid closes to form a seal with the neoprene lip, helping to retain moisture and to keep food fresher longer. Microchip Compatibility: Works with 9 (Avid Secure), 10 (FDXA) and 15 (FDXB) digit microchip numbers; if unsure of your pet s microchip number, you can check with your veterinarian, pet shelter or animal rescue. Automatic Cat Feeder opens when the assigned pet microchip ID approaches, and closes when it moves away.