It has a gas-spring mechanism for assisted height adjustments.
Brad's Deals Editor Jim,
This Standing Desk Converter was already on sale for $164.94, but you can get it for $135 when you use the code BRADSBCP3276 during checkout at Best Choice Products. Shipping is free. Many of these tabletop sit-to-stand workstations sell for $200 or more, and this is the best price we can find anywhere by about $30. It has two tiers, one for your computer monitor and one for your keyboard. The standing desk converter also has a gas-spring mechanism for assisted height adjustments. It can hold up to 55 lbs. There's no sales tax (except CA and IN).