Genie 4042-TKH 37281V Garage Door Opener with 3/4+ HPC DC Chain, Gray, 39.80" x 11.75" x 9.50" ULTRA-QUIET OPERATION: The SilentMax 1200 is an ideal garage door opener for garages attached to living spaces. POWERFUL AND SMOOTH OPERATION: The powerful 140V DC motor features a soft start and stop control for smooth door travel. FAST AND EASY INSTALLATION: With no additional hardware required for assembly, the c-channel rail makes for faster, easier installation. DURABLE AND RELIABLE: The steel-reinforced belt drive system adds strength, durability and value to the SilentMax 1200. SAFE AND SECURE: The Self Diagnostic Safe-T-Beam system helps prevent accidents and Intellicode Security technology helps prevent unauthorized access.