THIS IS VERY GOOD QUALITY POWER SETUP
FOR QUADCOPTER 450MM 500MM 550MM Size
4 motors and 4 esc 
DJI 2212/920KV
Dimension : 28X24mm
Rating : 920kv
Battery : 3S,4S
Shaft : 8.0mm
Weight : 50
Max Current : 30A
Max Thrust: 850g
Recommended prop :
Li-Poly (11.1V)3s : 10×4.5
Li-Poly (14.7V) 4s: 8X4.5
Max Power: 370W
 
READYTOSKY SIMONK 30AMP ESC
Highest efficiency 100% N-FET design.
Super high refresh rate, no buffering of the input signal,
resulting in more than 490Hz response rate.
16KHz motor frequency, giving fastest response of the motor
, and quietest operation as well (no 8KHz squeal).
Super simple, foolproof operation! Nothing to program other
than the throttle range.
ESC Specs:
Cont. current: 30A
Max. current: 35A
Input Voltage: 2-4S lipo 
11.1 v ,14.8v
BEC: 5V 2A (Linear mode)
Weight: ~22g
 
Package Including:
4 x DJI 2212 920KV Brushless Motor
4x  SImonk 30amp esc