The Ascent Series A3500 from Vitamix offers intelligent design inside and out. This powerful machine has five program settings that will automatically detect the size of your container, so that foods are blended perfectly according to volume and recipe. With its built-in programmable timer, you have the flexibility to set the time and speed and the A3500 counts down and stops when blending is complete. Self-Detect containers allow you to build a customized blending system that fits your needs (available in 20 ounce and 8 ounce sizes.) Containers from the G-series, C-series and S-series are not compatible with the Ascent Series machines.