The fan uses a high-energy, high-speed motor, which generate excessive heat if used continuously for a long time. It is recommended to use the blower in short bursts to avoid overheating. On average, it provide about 10-15 minutes of full-load use time, depending on the energy provided by the battery. Suitable for lithium batteries (batteries not included), the thrust is too great, and leaves, debris and dust tremble in front of the relentless wind. With powerful airflow and construction, this lithium-powered blower can be used for a variety of tasks and is suitable for professional and DIY applications. It is a reliable tool for tasks that require strong winds, The wind force can reach 0.92 KG. Battery life:maximum wind life is about 1 hour/low wind 6 hours Full power wind pressure:about 500g Maximum power:about 900w Air flow rate:3.8m/min Wind speed:0-15m/s Speed:0-22000r/min Rated voltage:21v Wind force can reach 0.92 KG Suitable for 18v batteries Colour:Blue & Black Material:ABS Package Contents: 1 * Fan Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.