It is a general purpose chassis mounting mains transformer. Transformer has 240V primary windings and centre tapped secondary winding. The transformer has flying colored insulated connecting leads (Approx 100 mm long). The Transformer act as step down transformer reducing AC - 240V to AC - 12V.
This heavy duty size 3548, 1100kv BLDC motor gives maximum thrust of 2200gms and weights only 176gms. It has pretty good electrical efficiency because of its precision built and high quality parts. It is best suited for large size Quadrotor (quadcopter), Hexacoptor, Octacoptor etc