Small, safe heater designed for tiny aquariums. Provides gentle, reliable warming with precise control while staying compact and energy efficient. Key benefits and features Safe low‑pressure design: delivers gentle, consistent heat appropriate for small tanks and delicate fish. Built‑in thermostat: maintains stable temperatures so tropical or temperate species experience fewer temperature swings. Low power consumption: 10W operation uses minimal energy for efficient heating and lower running costs. Ultra‑compact, desk‑friendly size: fits on a tabletop, nightstand, or other small surfaces without taking up space or creating clutter. USB powered for flexible placement: runs from standard USB ports, wall adapters, or portable power banks for easy setup anywhere. Ideal capacity: designed specifically for small aquariums roughly 2–5 liters. How this solves common problems Prevents rapid temperature changes that stress fish by providing steady, controlled warmth. Saves space in cramped rooms or desktop setups where a full‑size heater would be impractical. Reduces energy use compared with higher‑wattage heaters, helping keep operating costs down. Enables portable or temporary tank arrangements by using widely available USB power sources. Practical uses Small betta or tropical desk tank on a nightstand, office desk, or dorm room where space is limited. Nursery or fry tanks that need steady, gentle heat to improve survival and development. Portable or temporary setups powered by wall adapters or power banks for easy placement anywhere. Simple to use Plug into a compatible USB power source, place in a small aquarium (about 2–5 liters), and let the built‑in thermostat maintain stable warmth.