Z-Wave Outlet Mini Plug-in Socket MP21Z - Compact Z-Wave 800 Series

In this review of the Z-Wave Outlet Mini Plug-in Socket MP21Z the bottom line is simple: this tiny smart plug is for Z-Wave hub users who want a compact, reliable in-wall extender and remote switch for lamps and small appliances. The reviewer found the upgraded 800 series chip and S2 security deliver faster pairing and improved signal stability compared with older models, making it a practical pick for SmartThings, Hubitat or Wink setups that need additional nodes and remote control. It is not a stand-alone Wi-Fi plug and requires a certified Z-Wave hub to unlock voice assistant and scheduling features.

Key Features

• 800 Series Z-Wave: The upgraded 800 series chip offers faster communication and S2 authenticated security for safer, more responsive control.
• Built-in Repeater: Acts as a range extender to improve mesh coverage and can extend wireless range up to about 1300ft when your hub supports Long Range.
• Compact 15A Outlet: Small footprint yet provides a grounded 15A, 125 VAC receptacle that fits behind furniture and supports lamps and many small appliances.
• SmartStart and Easy Setup: SmartStart pairing and a no-wiring plug-in design make adding the device to a Z-Wave network straightforward for most users.
• Schedule and Automation: Timers and scene support let you reduce energy use by scheduling on/off events through your Z-Wave hub and combining the plug with other devices.
• Wide Hub Compatibility: Works with SmartThings, Hubitat, Vera, Wink, Fibaro, Homeseer, Ring and other Z-Wave certified hubs for broad ecosystem use.

Who It's For

This plug is aimed at homeowners and hobbyist integrators who already run a Z-Wave smart home and need a small, unobtrusive outlet that doubles as a network repeater. It is especially useful for people who want to add remote control, scheduling and extra mesh nodes without sacrificing access to a grounded plug.

It is not for buyers seeking a direct Wi-Fi or Bluetooth smart plug or those without a Z-Wave certified hub. Also, users requiring heavy-duty appliance control beyond 15A or expecting plug-and-play voice control without a hub should look elsewhere.

Pros & Cons

Pros

• Small form factor fits tight spaces while still providing a grounded 15A receptacle for common devices.
• Upgraded 800 series chip with S2 security improves pairing and network stability for many setups.
• Built-in repeater can strengthen mesh networks and extend coverage when used with compatible hubs.
• Simple plug-in installation and SmartStart pairing streamline setup for experienced Z-Wave users.

Cons

• Range and longevity reports are mixed; some users report weaker coverage or intermittent failures over long-term use.
• Requires a Z-Wave certified hub for full functionality and cannot connect directly to many voice assistants on its own.

Specifications

Device Type	Z-Wave plug-in outlet
Z-Wave Chip	800 Series with S2 and SmartStart
Receptacle Rating	15A, 125 VAC grounded
Repeater / Range Extender	Built-in (up to 1300ft with Long Range hub)
Frequency	Z-Wave 908.42MHz
Certifications	FCC listed, ETL listed
Hub Requirement	Z-Wave certified hub required (SmartThings, Hubitat, Vera, Wink, etc.)

Our Verdict

The MP21Z mini Z-Wave outlet is a smart, compact choice for anyone already invested in a Z-Wave hub who needs a grounded 15A plug plus a mesh repeater. It balances size, compatibility and security well and delivers good value for Hubitat or SmartThings setups, though buyers should accept that range and long-term reliability have had mixed reports.

Frequently Asked Questions

Do I need a hub to use this plug?
Yes. A Z-Wave certified hub is required for pairing, scheduling and voice assistant integration.

Will it extend my Z-Wave network?
Yes. The device includes a built-in repeater and can extend coverage, up to about 1300ft when used with a hub that supports Long Range.

Can it connect directly to Alexa or Google Assistant?
No. Voice assistant control requires a compatible Z-Wave hub to bridge the device to Alexa or Google Assistant.