Feature 1Professional Design: ELRS receiver with PWM output. Supports 5 PWM outputs. It also supports flash CRSF output firmware, when CH2 corresponds to TX and CH3 corresponds to RX. 2Failsafe: In case of connection or signal loss between the radio transmitter and receiver, the failsafe function adjusts all channels to the user set failsafe value, maximizing safety and preventing flyaways. 3Cautions: If you are not using a flight controller, such as an RC fixed wing, it is necessary to set the fail safe values correctly. 4Widely Applicable: ExpressLRS micro receiver module is suitable for fixed wing, helicopter, RC car, boat and many other types of models. 5Lightweight and Compact: ELRS micro receiver is light weight, 19x32x6mm / 0.75x1.26x0.24in size can be easily placed in most model nacelles, plug and play. The design with housing is more simple and convenient.Item Type:ExpressLRSMicroReceiverMaterial: ABSSize: Approx. 19x32x6mm / 0.75x1.26x0.24inNumber of Channels: 5 CHOperating Voltage: +5V~9V DCReceiving Protocol: PWM, CRSF SwitchableFrequency Band: 2.4Ghz .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x ExpressLRSMicroReceiverNotePlease allow some error in manual measurement.