Pro Shrimps are high quality safety heaters with adjustable temperature dial and dry run protection, which protects you from burns and the heater from exploding/shattering because of overheating. These new heaters are made from a special plastic, so no glass involved. Adjustable heater for nano aquaria Nano adjustable safety heater Nano adjustable safety heater 25 W Energy-efficient heating Temperature adjustment scale 17-36 C, 16cm total length, 4.8cm wide and only 2.7cm thick Super slim and unintrusive plug Semi-electronic temperature control With indicator LED and protection against dry running for safetys sake Shatter-proof special plastic For fresh- and saltwater