Forma Splint 24 1 2 X 18 1 2 (Interior Tank Size) Physician Supplies Matrixed Audio Tone and A B Color:Yellow Matrixed Audio Tone and A B Ratio for Dual Channel Systems * Free Sale Certificate(FSC) Power supply ≤3mA Battery A13 Working Time 250 300 hours Battery type zinc empty battery Waterproof Spacious stainless steel interior accomodates splinting sheets up to 24 x 18 working tank with a cover * Features dual thermostatic controls on high (175oF) and low (160oF) that can be adjusted individually * Dual independent heating elements for both settings provide quick warm up and automatically convert to a more effecient circuit once the working temperature is reached * Grounded hospital grade plug and high heat safety switch *