LP405 — 25 A Smart Plug with Energy Monitor
LP405 is being re-listed with the upgraded firmware. Join the restock list and we will email you the moment it is back on Amazon.
Overview
The LP405 is a heavy-duty smart socket for appliances that draw serious current. Inside is a magnetic latching relay rated to 25 A with more than 100,000 switching cycles, metering circuitry that reports to the Tuya / Smart Life app, and a memory card slot for logging every reading locally. The colour display shows live watts, accumulated energy and cost — without opening an app.
Highlights
- 25 A continuous, magnetic latching relay (zero holding power, no arcing)
- Real-time metering: voltage, current, power, power factor, kWh
- Electricity cost calculated from three configurable time-of-use rates
- Over-voltage / under-voltage / overload protection with auto-recovery
- Local button control that keeps working without Wi-Fi
- SD card logging (up to 128 GB) for offline usage history
- Tuya / Smart Life ecosystem — Alexa and Google Home via the app
- Colour display with live readings and working hours
Specifications
| Parameter | Value |
|---|---|
| Rated current | 25 A continuous |
| Input voltage range | 80 – 300 V AC |
| Measurement resolution | 0.1 V / 0.01 A / 0.01 kWh (±1% current accuracy) |
| Relay type | Magnetic latching, >100,000 cycles |
| Protection | Over-voltage, under-voltage, overload (trip points configurable) |
| Connectivity | Wi-Fi 2.4 GHz — Tuya / Smart Life |
| Local storage | MicroSD card, up to 128 GB |
| Control | App, four local buttons, voice via Alexa / Google Assistant |
Where it fits
Air conditioners, space heaters, dehumidifiers and pumps are the usual suspects. Before you connect anything, check the appliance’s nameplate current against your circuit rating — the plug is rated for 25 A, the circuit may not be.
In the box
- LP405 smart plug
- Quick start guide
- Warranty & support card
Manual
The full manual (PDF) is available on the support page.
FAQ
Does it work without internet?
Yes. Local buttons keep switching the relay and readings are written to the SD card. App control and cloud history require Wi-Fi.
Can I use it with a heater or AC?
Yes, up to 25 A, provided the appliance and its circuit are rated for that current. Always size the plug and the circuit to the appliance’s nameplate rating.
Does it support time-of-use billing?
Yes. You can set three rate periods and the plug calculates cost as energy accumulates.
What app does it use?
Tuya Smart or Smart Life — both are free. Alexa and Google Home are supported through the app’s integration.
