Features: 1.Professional 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. 2.Failsafe: 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. 3.Cautions: If you are not using a flight controller, such as an RC fixed wing, it is necessary to set the fail safe values correctly. 4.Widely Applicable: ExpressLRS micro receiver module is suitable for fixed wing, helicopter, RC car, boat and many other types of models. 5.Lightweight 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. specification:Item Type: ExpressLRS Micro Receiver Material: ABS Size: Approx. 19x32x6mm / 0.75x1.26x0.24in Number of Channels: 5 CH Operating Voltage: +5V~9V DC Receiving Protocol: PWM, CRSF Switchable Frequency Band: 2.4Ghz PackageList:1 x ExpressLRSMicroReceiver NotePlease allow some error in manual measurement.