Unbox Racerstar BR1407 3500kv Posted by LearningFPV | Jan 13, 2018 | Unbox | 0 | Product Link Racerstar BR1407 3500KV Specification Brand: Racerstar Item No: BR1407 3500KV Brushless Motor Height: 33.5mm Width: 19.8mm Weight: about 17g KV (rpm/V): 3500 Voltage: 7.4-11.1V Battery: 2-4S lipo battery