Sintron engineers smart coin & mobile-payment power boxes, ETL-listed NEMA connectors, and rugged RV power gear — trusted by laundromats, arcades, and workshops across North America.
From self-service businesses to off-grid adventures — every Sintron product is built around safety, durability, and smart convenience.
Coin, contactless & mobile-payment timer control boxes for massage chairs, washers, dryers, arcades, and vending — turn any appliance into a self-service business.
View the series →ETL-listed industrial-grade plugs, connectors, and flanged inlets. Heavy duty, DIY-rewirable, rated up to 50A / 12,500W.
View the series →Weatherproof shore power inlets and twist-locking generator connectors for RVs, campers, marine, and home transfer switches.
View the series →Stands and wall mounts for Echo Show, Echo Dot & Google Nest — including our best seller with 6,600+ reviews.
View the series →ST-001 through ST-005 — from a programmable coin acceptor to LCD power boxes that take Apple Pay, Google Pay, PayPal, Venmo and Cash App.
▶ Watch the full ST-004 introduction
One box. Every payment method. The ST-004 accepts coins and contactless payments — Apple Pay, Google Pay, PayPal, Venmo, and Cash App — and meters power by time, so your massage chairs, washers, and dryers earn while you sleep.
ETL-listed, industrial-grade, weatherproof. The hardware professionals trust for generators, shore power, and heavy-duty appliances.
Our best-reviewed product line — over 12,000 ratings across the family. Adjustable stands for Echo Show, space-saving wall mounts for Echo Dot and Google Nest Mini.
Independently tested and certified to North American electrical safety standards.
Apple Pay, Google Pay, PayPal, Venmo & Cash App support — no extra POS hardware.
Heavy-duty enclosures and connectors rated up to 50A / 12,500W for real-world abuse.
Fast Prime delivery, easy returns, and verified customer reviews on every product.
▶ Our most-watched video on YouTube
"Solid build quality and the twist-lock holds tight even with the generator vibrating. Exactly what my transfer switch needed."
"Installed the flanged inlet on my shed for shore power. Weatherproof cover is a nice touch — fit and finish feel premium."
"Turned two massage chairs into a passive income machine. Customers tap their phone and the chair starts. Setup took an afternoon."
Browse the full Sintron catalog on Amazon — Prime shipping, verified reviews, and brand-direct support.
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