Features: 2 in 1 design, this calculator handwriting board calculator and writing board combination. The stylus magnetically fixed on the side, so you can calculate and record at any =time. The calculator keyboard made of silicone, which can bring you a more comfortable touch and silent. Lightweight flip type calculator, will protect the keyboard well. And its portable size will allow you to take it with you. Use 120mAh lithium battery type-C charging phone computer universal, a great choice for an environmentally friendly lifestyle! 12 Digits display with large handwriting screen for multi-purpose. Specifications: Name: Calculator Handwriting Board 6inches Product model: HYD-65101 Lithium Battery: 120mAh Material: environmentally friendly ABS+Silicone Working temperature: 0-4 ℃ Display panel: LCD flexible LCD+calculator Reflectivity: 25%~30% Pressure output: 100-200g Size: approx 150mm x 90mm x18mm/5.9x3.54x0.71in Net weight: 135g Color: Black/ Gray/ White/ Pink Package Includes: 1PC x Calculator Handwriting Board 1PC x Magnetic Writing Pen 1PC x User Manual note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.