S2 PRO Aquarium Smart LED Timer Controller – Dimmer & Sunrise

Take Full Control of Your Aquarium Lighting

The S2 PRO Aquarium Smart LED Timer Controller is an intelligent lighting control system designed to bring your fish tank to life with smooth, natural light transitions. Compatible with most LED aquarium lights on the market — including Chihiros fixtures — this compact controller combines a precision timer, 100-level dimmer, and a breathtaking sunrise/sunset simulation into one sleek device. Made in Mainland China.

Why Aquarists Love the S2 PRO

• 8 Programmable Timing Groups: Schedule up to 8 independent brightness-and-time presets per day, giving you complete flexibility over your tank's lighting schedule.
• 100-Level Smooth Dimming: Infinitely variable dimming with gradual transitions that are gentle on fish, shrimp, and aquatic plants — reducing sudden lighting shock and helping maintain a stable aquatic environment.
• Sunrise & Sunset Simulation: Mimic nature's light cycle automatically. The S2 PRO delivers smoother, more gradual dawn-to-dusk transitions than its predecessor, creating a truly natural aquatic atmosphere.
• Night Light Mode: Set a low brightness level at T1 to maintain a subtle ambient glow through the night — ideal for keepers of arowana and other fish that benefit from gentle overnight illumination.
• Power-Off Memory: Never lose your settings — the controller retains all programmed data even after a power outage.
• High-Precision Epson Crystal Oscillator: A 32.768 kHz Epson crystal oscillator with 10 ppm accuracy ensures your lighting schedule stays perfectly on time, day after day.
• Energy Saving & Quiet Operation: Variable-frequency technology reduces electrical noise by over 30% and can cut energy consumption by more than 35%, while extending the lifespan of your LED fixtures, water pumps, and cooling fans.
• Versatile Compatibility: Works with LED lamps, DC cooling fans, and most wave-making pumps. Suitable for LED lighting fixtures with a constant-voltage power supply rated at 36V or less and under 80 watts.
• Compact & Easy to Install: Measures just 7 cm × 3.9 cm. Simply connect the S2 PRO in series between your lamp and its power supply using the included 5.5 mm DC male/female locking cable — no tools required.
• Industrial-Grade LED Display: Clearly readable from any angle, day or night. Replaces bulky mechanical timers and frees up your power strip.

Technical Specifications

• Model: Smart S2 PRO
• Compatible Voltage: LED fixtures ≤ 36V
• Max Power: Less than 80 W
• Power Supply Type Required: Constant voltage (not constant current)
• Connector: 5.5 mm DC male & female locking cable
• Dimensions: 7 cm (L) × 3.9 cm (W)
• Timing Groups: 8 programmable sets
• Dimming Levels: 100
• Crystal Oscillator: Epson 32.768 kHz, 10 ppm accuracy
• Material: Plastic
• Warranty: 1 Year
• Origin: Made in Mainland China

How to Install

1. Confirm your LED lamp runs on a constant-voltage power supply rated at ≤ 36V and < 80W.
2. Unpack and inspect the S2 PRO controller.
3. Connect the controller in series between your LED lamp and its power supply using the 5.5 mm DC locking cable.
4. Plug in the power — the controller starts automatically.
5. Program your preferred timing and brightness settings via the intuitive button interface.

Quality You Can Count On

Built with 0.05 µm surface-mount technology and factory-tested to achieve a failure rate of less than 1 in 1,000 units. Backed by a 1-year warranty for complete peace of mind.

For general guidance on setting up healthy aquatic environments for fish and aquatic life, visit the U.S. Environmental Protection Agency (EPA) for water quality resources, or explore aquarium care best practices at the Smithsonian Institution.

Frequently Asked Questions

Q: Is the S2 PRO aquarium LED timer compatible with Chihiros lights?

A: Yes — the S2 PRO is specifically designed to be compatible with Chihiros LED aquarium lights, as well as most other LED aquarium fixtures on the market that use a constant-voltage power supply rated at 36V or less and under 80 watts.

Q: What is the difference between the S2 and the S2 PRO controller?

A: The S2 PRO offers several key upgrades over the standard S2: smoother sunrise and sunset transitions (T1 and T4 brightness can be set to 0 for seamless fades), a dedicated night light mode for low-level overnight illumination, and improved variable-frequency technology that further reduces operating noise.

Q: How do I know if my LED lamp is compatible with this controller?

A: You need to verify two things — first, that your lamp's input voltage is 36V or less, and second, that its power supply is a constant-voltage source (not a constant-current driver). Check your lamp's power adapter label. If it shows a fixed output voltage (e.g. "Output: 24V DC"), it is a constant-voltage supply and is compatible.

Q: Will the S2 PRO lose its settings if there is a power outage?

A: No. The S2 PRO features built-in power-off memory. All your programmed timing groups and brightness levels are retained even after a complete power interruption, so you won't need to reprogram it after an outage.

Q: Can the S2 PRO control devices other than LED lights?

A: Yes — in addition to LED aquarium lamps, the S2 PRO can drive DC cooling fans and most wave-making pumps, making it a versatile single-controller solution for your aquarium setup.