Warmers heat up after being plugged into a USB outlet. Set your level of warmth to low or high. Adjustable straps let you get the warmers as snug as you like while leaving fingers free to type. One size fits most. Each toast measures 5.5" x 5.5". Cord length 57". Compatibility: PC, Mac, Linux, any USB-enabled device that can handle 5V, 3W with 1.5M USB line. Not suitable for children under 6.
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