Why you need this heater Keeps water at a stable 26°C to provide a consistent, healthy environment for betta and tropical fish without constant manual adjustments. Small, reliable heat source designed specifically for very small tanks and portable setups where fullsize heaters are impractical. Built for safety during continuous submersion to reduce the risk of leaks and electrical faults. Key benefits and features Intelligent temperature control: automatically maintains a constant 26°C so fish avoid stress from temperature swings. Clear status indicators: intuitive red/green lights show heating status at a glance, improving usability in different aquarium conditions. Compact, lightweight design: 10W power is optimized for 3L small tanks, conserving space and keeping desktop or desktopstyle aquariums uncluttered. Durable, waterproof construction: crackresistant, shatterproof frame with a rubbersealed waterproof system for reliable operation during continuous submersion. USBpowered adaptability: powers from USB for easy connection to power banks, adapters, or portable power sources—ideal for mobile or temporary habitats. Compatibility and performance Function: maintains a steady 26°C suitable for betta and tropical fish needs. Size and power: 10W unit recommended for small tanks up to 3L. Materials: reinforced, shatterproof housing with rubber sealing to prevent leaks and electrical faults. Operation: designed for continuous submersion; status LED shows heating activity. Practical use scenarios 1. Desktop betta tank at home or office — provides quiet, consistent heating without taking up space or requiring frequent adjustments. 2. Travel, quarantine, or temporary transport containers — USB power and compact size keep water temperature stable while moving habitats frequently. 3. Portable or outdoor setups (pet shows, shortterm displays) — USB adaptability and waterproof design let you control water temperature in temporary installations. Quick specifications Temperature: constant 26°C Power: 10W Recommended tank capacity: up to 3L Power source: USB Construction: crackresistant, shatterproof frame; rubbersealed waterproof system Indicators: red/green status lights Suitable for: betta and tropical fish; continuous submersion safe This heater delivers steady, spacesaving warmth for small tanks and portable setups while prioritizing durability and simple operation.