From the Aventon Aventure website:
MOTOR
1130W (Peak) 750W (Sustained), 48V Brushless Rear Hub Motor
I'm coming up on about my year anniversary with my Aventure and could not be happier with the purchase. The bike has plenty of power and excellent battery range. I was able to test ride a few different brands at the time of my purchase and found the ride quality, fit and finish, power, and battery range of the Aventon exceeded the others in its price range. I know the prices have probably gone up but at the time found it to be a great value as well. Good luck with your purchase.