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Questions about this product? Free pre-sales support from a senior specialist — product questions, compatibility checks, BOM quotes, price confirmation — typically answered within one business day. Need camera placement or system design work? Engineering time is $175 per hour (qty 1 = 1 hour). Hardware buyers get up to one hour ($175) credited back on their order.
The Lenovo 4X21L38720 is a 135W external power brick designed for ThinkCentre (TC) compact and all-in-one desktop systems requiring a slim-tip (ST) DC connector. At 135W, it supplies enough headroom for fully-loaded ThinkCentre configurations — integrated graphics, spinning HDDs, and populated RAM slots — without the thermal or power-delivery compromises you'd face dropping to a lower-wattage unit. This is a genuine factory-new adapter sourced direct from Lenovo, not a third-party substitute, which matters for firmware-based power negotiation on systems that validate adapter identity at boot.
Designed for Lenovo ThinkCentre desktop systems that specify a 135W slim-tip (ST) power adapter. The ST connector is Lenovo's current-generation slim rectangular DC plug — verify your existing adapter's label reads 135W and shows an ST connector before ordering, as ThinkCentre lines also ship with 65W and 90W variants that are not interchangeable. If you are replacing a failed unit on a desktop power adapter, match the wattage and connector type from the original adapter's label exactly. This adapter is specified for the US market (standard 100–120V AC input via the included or existing IEC power cord).
Plug the DC slim-tip connector firmly into the system's DC-in jack until it seats — a partial connection on ST-style connectors can cause intermittent power faults that mimic hardware failures. The adapter is external (brick-style), so ensure adequate airflow around it in rack or cabinet deployments; do not bundle tightly with high-heat cabling. Confirm AC input voltage at the outlet matches the adapter's rated input before connecting.
Manufacturer-verified compatible cameras, recorders, mounts, accessories, and licenses for this product. Adjust quantities and add the entire bundle to your cart in one click.
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