Product Description Overview:The Command Access ETH4W5K4545 626 CH-BB79 Energy Transfer Hinge is a 4-wire, 5-knuckle, standard weight hinge designed to discreetly route 26-gauge low-voltage power from the door frame to the locking hardware. With no exposed wires, it provides a secure and professional installation for a wide range of electrified door hardware applications. Specifications: SKU: ETH4W5K4545 626 CH-BB79 Size: 4.5″ x 4.5″ Finish: Satin Chrome (626) Weight: Standard weight hinge Design: 5-knuckle, full mortise Wire: 4-wire, 26-gauge conductors for low-voltage transfer Application: Interior or exterior commercial doors Hinge Type: Energy Transfer Hinge (ETH) Typical Uses: Electric mortise & cylindrical locks Electric strikes (especially for paired doors) Electrified exit trims & latch pullback devices Door-mounted card readers Low-voltage door lighting Features & Benefits: Conceals wiring within the hinge for a clean, tamper-resistant appearance Provides reliable low-voltage power transfer without restricting door operation Compatible with a variety of access control and electrified locking solutions Satin Chrome finish ensures corrosion resistance and a professional look Built for long-term durability in high-traffic environments