Serta | Smart Heated Waterproof Mattress Pad with Safe & Warm Low Voltage Technology, 233 Thread-Count (Twin) INCLUDES: (1) Mattress pad FEATURES: Patented Safe & Warm non-hazardous low voltage technology is safe in the presence of moisture, will not harm pets, and emits no EMFs. Our patented low voltage technology is the only electric mattress pad technology that is certified as non-hazardous. Single control automatically shuts off after 10 hours for convenience. Giant backlit display with auto dimming feature for night time adjustments with out having to turn on the lights CARE INSTRUCTIONS: Machine washable & dryable without any pilling, shrinking or stretching DIMENSIONS: Twin - 38" x 75" x 10"