Smart Switch SMS Controller 3G/4G is a compact, rugged remote-control hub designed for boats, off-grid setups, and anywhere you need reliable, phone-based automation. Turn devices on or off with a simple SMS, and manage power and notifications without a computer or app.

Product code SMS-8-3G/4G

What it does best

• GSM-powered automation: Control eight inputs and four outputs via SMS across a 12–30 VDC supply. No internet app needed—send a text, get a reply, and keep systems running.
• Flexible I/O with smart routing: Eight inputs (four positive switching, four negative switching) can be named and linked to any of the four outputs. Create custom logic where a single input triggers multiple outputs, or vice versa.
• SMS-based configuration: Name inputs/outputs, set delays up to 15 minutes, choose latching or non-latching behavior, and select normally open or normally closed states—all by SMS. No PC or special software required.
• Real-time status at your fingertips: Query the current status of any input or output from your phone whenever you need it.
• Security and multi-user access: Up to 12 Master Users can manage settings, ensuring controlled access for crews, family, or remote teams.

Built for real-world use

On a boat, it becomes a central nervous system for essential gear. Power a fridge/freezer during long passages, light up underwater LEDs for night dives, or manage air conditioning from shore. It also keeps you informed with practical alerts—shore power disconnects, bilge-pump activity, or high-water alarms—delivered straight to your mobile.

Designed to survive demanding environments, this controller is a self-contained unit with auto-sensing power input, monitoring its own supply voltage, and alerting you if the battery drops to critical levels (11.5 VDC or 22.5 VDC). The compact footprint—117 mm x 78 mm x 30 mm—fits neatly in electronics bays, dashboards, or mounted enclosures, while its robust 12–30 V DC range makes it suitable for marine, RV, and workshop applications.

Why this Smart Switch stands out

• Direct SMS control means you can equip remote vessels or cabins to operate critical devices from anywhere with mobile coverage.
• Programmable, human-friendly naming for inputs and outputs lets crews quickly understand what’s controlling what, reducing setup time and confusion in high-stress situations.
• Delays and latching options let you tailor behavior to your system—for example, delaying a bilge pump start after a switch is triggered, or keeping a light on until you manually reset it.
• Comprehensive yet simple: Eight inputs, four outputs, and all configuration via SMS strike a balance between versatility and ease of use—great for DIY installers and professional fleets alike.

Use cases and ideal scenarios

Ideal for boat owners, off-grid cabins, or remote equipment bays where network access is limited but mobile signal is reliable. Typical scenarios include:

• Power management for fridge/freezer during long offshore trips.
• Remote activation of lighting, pumps, or climate control to protect assets and improve safety.
• Boat monitoring: instant alerts about shore power loss, bilge pump activity, or intrusion indicators.
• Asset protection in remote installations by linking inputs to critical outputs and receiving timely SMS updates.

Specifications at a glance

• Supply Voltage: 12–30 VDC auto-sensing
• Quiescent Current: 20 mA
• Data Retention: 10 years without power
• Dimensions: 117 mm × 78 mm × 30 mm
• Inputs: Eight inputs (four positive switching, four negative switching), with programmable names and delays
• Outputs: Four outputs with programmable names and linkable to any input
• Users: Up to 12 Master Users
• Networking: Connects to a GSM network for SMS control and status reporting

With the Smart Switch SMS Controller 3G/4G, you gain hands-off power management that’s practical, scalable, and secure—perfect for people who expect reliable remote control without cumbersome interfaces. Experience true peace of mind, knowing you can manage and monitor essential devices from the palm of your hand.