Keeps water at a steady 26C: intelligent heating control maintains a constant 26C, giving tropical fish such as bettas a stable, healthy environment without manual adjustment. Red/green status indicator lights show operating state at a glance. Built for small tanks and desktop setups: a 10W compact heater designed for 3L aquariums. Lightweight and spacesaving, it fits neatly into desktop or tabletop tanks without taking up excess room. Safe, durable construction: crackresistant, shatterproof frame plus a rubbersealed waterproof system reduces the risk of leaks and electrical faults during continuous submersion, so the heater can run reliably day and night. USBpowered flexibility: runs from USB power sources so it can provide consistent heating without a wall outlet—useful for outdoor setups, travel, or locations where mains power isn't convenient. Why you need it: keeps temperature stable to reduce stress and illness in tropical fish, eliminates the need for constant monitoring or manual thermostat adjustments, and gives peace of mind with a rugged, waterproof design. Key attributes Function: intelligent temperature control with fixed 26C output and visual red/green status indicators. Compatibility: sized and rated for very small tanks (3L) and species that prefer tropical conditions, like bettas. Size & weight: compact, lightweight 10W unit designed for minimal visual and spatial impact. Materials & safety: crackresistant, shatterproof housing with rubbersealed waterproofing for safe continuous submersion. Power: USBpowered for flexible placement and use without a wall outlet. Practical use scenarios Desktop betta bowl: keep a single betta comfortable on a workspace or mantel with nearsilent, selfregulating heat and clear status lights. Travel or outdoor display: run from a USB power bank or portable USB source to maintain stable temperatures when moving your small tank or setting up an outdoor display. Small quarantine or hospital tank: provide a consistent 26C environment in a 3L quarantine tank for shortterm care or observation without complex wiring. What it solves Prevents temperature swings that stress tropical fish. Removes the need for frequent manual adjustment or complex thermostats. Lowers risk of leaks and electrical faults with reinforced waterproof construction. Enables heating where mains outlets aren't available through USB power. Specifications Output: 10W Target temperature: steady 26C Recommended tank volume: 3L (small tanks) Indicators: red/green status lights Power: USBpowered Safety features: crackresistant, shatterproof frame; rubbersealed waterproof system suitable for continuous submersion