The Inventum HN139G electric underblanket measures 150 cm by 80 cm, designed for single person use with four adjustable heat settings. Constructed from soft fleece material in white, this heating blanket features an anti-slip underside that maintains its position on the mattress without requiring additional fastening. The detachable control switch with illumination allows easy temperature selection between four heat levels. For safety, the blanket incorporates automatic step-down functionality that reduces from settings 3 or 4 to level 2 after three hours of operation, followed by complete automatic shutdown after twelve hours. An integrated overheating protection system with sensor technology ensures the blanket automatically switches off if temperatures become excessive. This electric underblanket is machine washable at 30°C, though frequent washing may accelerate wear. After washing, gently press out excess water and allow the blanket to dry flat. When not in use, store in the original packaging without placing heavy objects on top to maintain product integrity. The blanket provides comfortable pre-warming when activated approximately thirty minutes before bedtime, with the option to turn off upon retiring or maintain lower heat settings throughout the night while covered with regular bedding to retain warmth.