Product Description Overview:The Command Access ETH4W5K4540 626 CH-BB79 Energy Transfer Hinge is a 4-wire, 5-knuckle, standard weight hinge built to transfer 26-gauge low-voltage power from the door frame to locking hardware without exposed wires. Designed for professional commercial installations, it ensures reliable power transfer while maintaining a clean, tamper-resistant appearance. Specifications: SKU: ETH4W5K4540 626 CH-BB79 Size: 4.5″ x 4.0″ Finish: Bright Chromium (625) 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 on paired doors) Electrified exit trims & latch pullback devices Door-mounted card readers Low-voltage door lighting Features & Benefits: Concealed wiring for improved security and aesthetics Provides dependable low-voltage power transfer without hindering door operation Compatible with a variety of electrified locking and access control devices Bright Chromium finish for high-end appearance Engineered for long-lasting performance in demanding environments