martimon7 Hello pilot. Eachine E99 uses wifi FPV system and does not use 5.8 GHz FPV system. Almost every FPV monitor uses a 5.8 GHz fpv system, so you won't be able to pair them with the Eachine E99.

martimon7 Any other which is 1S 200 or 250 mAh. Some other bigger mAh are to heavy for this little bird.

martimon7 It is 3mm holes size for 3M screw

martimon7 Idon't understand the exact question. Are you asking about the range of FPV goggles or quad 220s? FPV goggles have a decent signal range. You can fly with them to 300-500 m without losing the signal. Furthermore, I would not risk it myself.

martimon7 Thisis an amazingly accurate racer quad kit, that you have to put together yourself. The kit is without any electronics or motors. It's just a kit.

martimon7 No,it is not compatible with SKY02X. SKY02X have built-in receivers and do not have free docks for additional receivers. SKY04X and SKY04L have two free docks into which you can put any receiver.