GEMNS WePower Battery-Free Kinetic Switch Technology

GEMNS is the brand of WePower Technologies LLC, and it makes battery-free energy harvesting generators (EHGs). Pressing a button moves a magnet, and that motion produces enough electricity to send one wireless message. No coin cell. No wire to the switch.

The published material does not show a finished home switch range with relays, bridges and app support. This page is a researched summary of GEMNS's own site and trade coverage, not a hands-on review. Nothing from this range has been installed in a house here.

What GEMNS Actually Sells

According to gemns.com, the company's technology began in industrial settings, replacing wired limit and safety switches. The site places the G100 and G200 under Industrial and Manufacturing, for batteryless sensors and emergency switches across large operations. It places the G300 under Lighting Control, as self-powered controls that replace wired switches and can be mounted in more places.

The site lists example uses that include door and window sensors, leak detectors, lighting switches, ceiling fan controls and blind controls. It says the generators are designed into other makers' IoT devices and are compatible with Bluetooth, LoRa, ISM, Z-Wave, Matter and Thread. It does not mention Zigbee, Tuya, Alexa or Google Assistant, and it lists no relay, bridge, price or warranty. For specifications it points to its spec sheets and white papers, and for pricing to a contact form.

The G100 in Numbers

The most documented model is the G100, announced in May 2023 as a wireless panel switch for OEMs and product developers. Coverage of the launch from ElectronicSpecifier and others gives these facts:

• It fits a standard 22 mm panel-mount switch form factor.
• It uses stationary and oscillating magnets to harvest energy by electromagnetic induction.
• One press yields over 3 millijoules of usable energy, from a 70 ozf actuation force.
• The harvested energy can drive BLE, Zigbee Green Power, LoRa, Z-Wave and Thread radios, at up to 20 dBm of output power.
• The reference design pairs it with the EHC100 harvester board and the customer's own microcontroller or radio board.
• It is aimed at industrial uses such as remote on/off control, wireless door sensors and remote triggering.

Because the energy comes from the press itself, a battery-free switch can only send a message when someone presses it. It has no spare power to listen for commands or report a state.

The G300 and Lighting

In January 2026, WePower and Focus SB announced a battery-free wireless lighting controller built around the G300 harvester, shown at CES 2026. The press release says the switch assembly mounts directly in an existing in-wall gang box, so it works for retrofit or new installation without changing building wiring. The companies pitch it for residential, hospitality and commercial use.

The coverage found for this page does not name the radio protocol, a price or a retail date for that controller. Until those appear, treat it as an announced product, not one you can order.

What a Home Buyer Can Get Instead

If you want a battery-free switch now, retail kits from other brands exist. Retailer listings show RunLessWire kits at Lowe's that pair a kinetic rocker switch with a 5 A receiver, and MOES battery-free Zigbee switches that work through a Tuya Zigbee gateway with about 15 m of indoor range, per a Domadoo listing. That same data sheet states Home Assistant is not supported, and it calls the power source piezoelectric while the marketing copy describes a kinetic generator, so the listing contradicts itself in places. Verify specs before you order.

Battery-free switches have one structural limit. The switch has no radio listening, so it cannot receive a command or confirm state. A receiver, relay or hub sits on the other end and does everything clever. That is the part to research before buying, because it decides voice control, Home Assistant support and how long the product stays supported.

Questions to Ask Before You Buy Any Battery-Free Switch

Whoever makes the finished product, a few questions sort the good ones from the frustrating ones.

• Which radio does it use, and does my hub or coordinator speak it? Zigbee Green Power, Z-Wave, Thread and Bluetooth are not interchangeable.
• What does the receiver do when a press is missed? A single transmission with no acknowledgement can fail, especially through thick walls or near large metal objects.
• Does the maker publish how long it will support the receiver and its firmware?
• Is the receiver mains powered, and who installs it? Wiring a relay into a light circuit is electrician territory in many places.
• How does it look and feel? A firm mechanical press is part of the design, since the press is the power source.

Should You Wait for GEMNS

GEMNS is worth watching if you like the idea of switches with no cells to replace, and the Matter and Thread compatibility on its site suggests a path toward mainstream smart home gear. For now, you are looking at a component supplier with one announced lighting product, not a shelf of things to buy. If you want a mains-powered alternative, the Sonoff ZBMINIL2 is a Zigbee mini switch that needs no neutral.