Powerful 32cc Troy-Bilt 4-cycle engine generates up to 500 CFM at 150 MPH without the need to mix gas and oil Ergonomic design lets you take care of big jobs with ease Fully-tensioned multi-material suspension system distributes weight evenly and comfortably between shoulders and hips Easy-to-use tube-mounted throttle control Compression-release technology for easy starts SpringAssist™ technology for easier pull starts JumpStart™ compatible — can be used with a Troy-Bilt JumpStart engine starter, (Item#s 42781 or 42787, sold separately) to eliminate pull starts with the push of a button 72dBA noise level