Full specifications
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The HP LaserJet Enterprise MFP M634z is the fully-loaded mono A4 Flow MFP — 100-sheet multipurpose tray, two 550-sheet trays, 2,000-sheet HCI feeder, 1,000-sheet 3-bin stapler/stacker, fax, built-in Wi-Fi, stand, and a 9-inch color touchscreen all bundled in one SKU. It runs print at 52 ppm with auto-duplex, copies at 55 cpm, and scans through the 150-sheet single-pass dual-head ADF for two-sided originals in one pass. First page out is 5.2 seconds from ready (8.1 from sleep). Duty cycle is 300,000 pages a month with a recommended range of 5,000 to 30,000. Total input is 3,200 sheets out of the box once you count the HCI; max climbs higher with additional 550-sheet feeders. The 9-inch touchscreen runs HP FutureSmart with Workpath apps, embedded OCR, multi-feed detection, and scan-to-multi-destination shortcuts. Connectivity is everything: Gigabit Ethernet, USB 2.0, dual-band Wi-Fi, Wi-Fi Direct, NFC, BLE, AirPrint, Mopria, fax. HP Sure Start BIOS self-heal and run-time intrusion detection are standard. The thing buyers regret: paying for the loaded SKU when they don't actually need the HCI, finishing, or fax. If you don't need them, the M634h does the same print/copy/scan work for thousands less.