Compact size with 20 keys 2.4 GHz technology with USB receiver Range: Up to 10 m Quick switch from keypad to calculator mode With LCD display Small, lightweight and transportable anywhere Effortless calculation Ideal for accountants, office staff or students Compatible with Windows, Linux, Android and Mac OS Color: Black 1x AAA battery (included) General product data: Weight: 0.113 kg Height: 14 cm Width: 2.9 cm Length: 8.3 cm