spektrum dx4s battery tray expansion case

this case is designed for spektrum dx4s. it fits a zippy slim 4000mah 2s, and it also features two air intakes which can be converted to led sockets to provide lightings for when u play at night. there is also side vents that u can fit the charge lead through to charge it without taking the battery out. i also fit a power switch on the other side vent