This flybarless and single brushless small heli. is good for beginners. It's stable, easy maintain and cheap (just $13xx) with transmitter (interchangable Mode 1/2) in package. No need to find a transmitter to save cost. The battery is just $2X per pack (OEM). For 3D flying, the servos are a bit slow.
For your question below:-
細機是不是會比大機容易控制???
NO, smaller is more difficult. Larger is better but more expensive, even in running cost and maintenance cost.
現在的控全都是2.4G的是什麼意思?和以前的35/72MHZ FM控有乜分別???
More advance design, at least you are not necessary to check anyone has the same frequency as yours to avoid interference. It may cause crashes.
Sorry to reply or comment in English just to save time in inputting CHINESE.