Package: 1piece; Backing:3M adhesive backing. Size: 235mmx235mm. It's Electricity AND Heat you are coping with. We are absolutely your right choice with 100% guarantee for high quality heaters. Much safer and more reliable heat source than RepRap PCB heatbeds. With 1.2meter NTC 100K 3950 thermistor for temperature Control.(Choose Number 1 or Number 11 in the marlin firmware for the bed temperature sensor). Power consumption: 500W for 120v and 220v, 300w for 24V . Attached with two pieces 1.2meter length power wire.