2Pcs Original RadioLink R7EH 2.4G 7CH FHSS Receiver for RadioLink T4EU T4EU-6 T6EHP-E T6EHP-S T7F Transmitter RC Helicopter Multirotor RadioLink R7EH 2.4G 7CH FHSS Receiver Suit for Radiolink TX T4EU/T4EU-6/T6EHP-E/T6EHP-S/T7F Exquisite design for easy assembling. Max input voltage 5.5V.