There are 2 modes of the transmitter, Mode1(right hand throttle)/Mode 2 (left hand throttle), with built-in 18650 Batteries, can be used continuously about 25hrs. It also support PRM Simulotor (3.5mm audio interface).
1* OMPHOBBY M2 RC Helicopter Transmitter
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The OMPHOBBY M2 EXP/V1/V2 RC Helicopter Parts T6 Transmitter Controller With 2pcs 18650 3.7V 2500mAh Lipo Battery was built with people like you in mind. Something to keep you happy. Every. Single. Day.