Here is info on the one I got for son on Ebay. He's been inside and outside with it and has been able to go on low grow grass. One thing I noticed it's fast on a straight away. Battery life is good with about 3+ hrs of continue use. Construction is sturdy and not cheaply assembled. No need to spend more then $300 for one of these and we got this within 15 days direct from China Ebay seller.
There is also a 10in wheel version (more expensive) for more of off road.
Not sure if I can post seller link here? Any questions ask away.
HTH
Item specifics Condition:
New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ...
Brand: Unbranded/Generic Charging Time: 1H ~ 2H Low Battery Protection: Yes Country/Region of Manufacture: China Max Climbing Angle: 15° ~ 30° Max Power: 500W Battery: 36V * 4.4AH (160WH) lithium battery Max Loading: 120kg Working Temperature: -10 °C ~ +40 °C Size: 584 * 186 * 178mm / 23 * 7.3 * 7in Adapter Input:: 100-240VAC 50/60Hz 0.5A About Color: Write Down Color You Want Distance: 15km ~ 20km Speed Protection: 10km/h ~ 15km/h Tire Diameter: 170mm / 6.7in