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Specification for 8.5'': Material: ABS Input pressure: 10-20g Power Supply: CR2016 button battery (included). Reflective ratio: 25%-30% Product Size: 8.7 x 5.7 x 0.18 inches Screen Size: 6.9 x 5.1 Inches (a little bigger than IPad Mini) Weight: 3.8 ounces (110g) Input voltage: 3V Frequency: 1Hz Rated power: 18mw Waterproof level: IPX5 Battery Life: The battery generally will last for 2 years and is easily replaceable.Specification for 12'': Material: ABS Input pressure: 10-20g Power Supply: CR2016 button battery (included). Reflective ratio: 25%-30% Product Size: 11 x 7.3 x 0.19 (Inches) Screen Size: 9.4 x 6.6 Inches (bigger than iPad) Weight: 7 ounces (200g) Input voltage: 3V Frequency: 1Hz Rated power: 18mw Waterproof level: IPX5 Battery Life: The battery generally will last for 2 years and is easily replaceable.Package Content:1 x LCD Writing Tablet 1 x Writing Stylus