It elevates your laptop 2.5cm above the table top to drastically increases the airflow that could prevent overheating, save energy, and minimalism the fan noise. It angles your device for a proper ergonomic angle for a natural typing. It's ultra-compact that's 16cm when folded. When opened up, and the legs are not extended, the legs are 14.7cm long and 23.4cm wide. When the legs are fully extended they're 21.2cm long and 32.4cm wide. When the legs are extended they can be locked in place, at any length, to keep it in stable. It can use for laptops that are 17". It's in a very good condition.