The ONITY MODEL EDHT22I Hotel Key Encoder is a rectangular-shaped gray key with a chrome finish. It is made of plastic and steel, suitable for commercial, interior, room doors, and security doors. The key includes a manual, batteries, and has a bottom mount for universal use. With a Bluetooth smart home protocol, this key offers 10 user codes and operates on 6 AA batteries. Its extension length is 10.75 inches, and it has a unit height of 3.5 inches. Perfect for businesses and industrial applications, this key provides a secure and reliable access control solution.