Via Aqua heaters come with an external temperature control, stainless steel heat probe, waterproof double insulation, indicator light for on and off cycle, remote temperature probe and is submersible. ViaAqua Titanium Heaters Feature: ViaAqua Titanium Heaters incorporate the best technology and electronic components to date! Safe and reliable in both fresh and salt water aquariums! Adjustable temperature setting! Easy to read temperature indicator! Compact design. 1-year manufacturer`s warranty.