Racerstar BR2304 1850KV 2-3S Brushless Motor For RC Airplane Model 703 What's the difference between A

What's the difference between A and B :

RC receiver

Compared to the RS2205

We've driven it inside the office and notice it is not easy to tip over

Camera takes photo and record video in real time

Racerstar BR2304 1850KV 2-3S Brushless Motor For RC Airplane Model 703 What's the difference between ADescription: Brand Name: Racerstar Item Name: Brushless Motor Series Name: BR2304 KV: 1850 Working Voltage: 2 3S LiPo Weight: 21g Testing Data: Model KV (rpm V) Voltage (V) Prop Load Current (A) Pull (g) Power (W) Efficiency (g W) BR2304 1850 7. 4 8040 7. 8 380 57. 7 6. 6 9040 11. 0 420 81. 4 5. 2 Package Included: 1x Racerstar BR2304 1850KV Brushless Motor