What it does for you Rapid, consistent heating: nickel‑chromium heating element provides fast heat accumulation and good thermal conductivity so the tank reaches and maintains the set temperature quickly. Stable, safe temperature control: a mechanical constant‑temperature thermostat with automatic adjustment delivers accurate temperature setting and prevents overheating that could harm fish. Built for aquarium use: a glass heating rod specifically designed for fish tanks, suitable for freshwater aquariums. Key features and benefits Nickel‑chromium fast‑heating wire — faster warm‑up and reliable heat transfer for quick stabilization of water temperature. Mechanical constant temperature control — simple, durable thermostat operation that keeps the water steady without frequent manual adjustments. Precise temperature adjustment — high adjustment accuracy and automatic regulation reduce temperature swings and protect aquatic life. Safety protective sleeve — white anti‑collision wool external sleeve at the bottom offers cushioning and impact protection for both the heater and tank inhabitants. Time- and energy‑efficient — quick heat accumulation shortens warm‑up time and reduces run time, saving time and electricity compared with slower heaters. Glass construction — corrosion‑resistant, aquarium‑safe material designed for immersion in freshwater environments. Compatibility and materials Intended for freshwater aquariums (universal freshwater use). Transparent glass rod housing with nickel‑chromium heating element and external white anti‑collision sleeve at the bottom. Mechanical thermostat for reliable, low‑maintenance operation. Typical use scenarios Home freshwater aquarium: quickly bring small to medium tanks to a stable temperature for community fish, live plants, or shrimp. Breeding or fry tanks: precise, steady temperatures help improve survival rates during sensitive growth stages. Quarantine or hospital tanks: fast heat recovery and reliable temperature control support stressed or recovering fish without frequent monitoring. Practical notes Install fully submerged according to tank size and the heater’s placement guidance. Use the mechanical temperature dial to set the desired water temperature; the heater will automatically maintain that temperature. The external white anti‑collision sleeve adds a layer of protection between the glass rod and tank contents or decor. This heater combines rapid nickel‑chromium heating, precise mechanical temperature control, glass construction for aquarium safety, and an anti‑collision sleeve to deliver reliable, energy‑efficient warmth for freshwater tanks.