Reliable, setandforget heating: Intelligent temperature control keeps water at a steady 26°C, ideal for betta and tropical fish. Eliminates constant manual temperature adjustments so you can maintain conditions with minimal effort. Clear status feedback: Builtin red/green indicator lights show operating status at a glance, making monitoring simple and modern. Compact, efficient design for small tanks: 10W power is matched to 3 L aquarium volumes, delivering effective heating without wasting energy. The small, lightweight form factor blends unobtrusively into desktop and microaquarium setups. Safe, durable construction: Crackresistant materials and a shatterproof body reduce breakage risk. A rubbersealed, waterproof design provides leak operation and electrical protection, supporting steady temperature control with greater safety. USBpowered convenience: Operates from USB power—no wall outlet required—so it works with power banks, USB adapters, or computer ports for portable, temporary, or mobile aquatic applications. Key specifications and functions Target temperature: 26°C (consistent output via intelligent control) Power: 10W Recommended tank size: 3 L (small/micro aquariums) Indicators: Red/green status lights Construction: Crackresistant, shatterproof casing; rubbersealed waterproofing Power source: USB (portable, no outlet required) Practical use scenarios 1. Desktop betta tank: Maintain a stable 26°C for a single betta in a 3 L desktop aquarium—minimal space used, simple USB power from a computer or phone charger. 2. Temporary or quarantine setups: Quickly provide safe, reliable heating for a small quarantine cup or hospital tank during treatment or acclimation without needing an outlet. 3. Mobile or travel use: Power from a USB power bank to keep water temperature steady in temporary displays, travel tanks, or popup aquatic exhibits. Why choose this heater Designed specifically for very small tanks where precise, stable temperature matters. Reduces stress on sensitive tropical species by keeping temperature consistent. Built for safety and portability so you can heat small aquatic environments reliably without bulky equipment. What it does not change Intended for small, 3 L tanks; not sized for larger aquaria. Maintains a fixed 26°C output using its intelligent control system; no manual setpoint adjustment is required.