SpecificationER4Item: ER4 2.4GHz ELRS PWM ReceiverPower supply: DC 4.5 - 8.4VAntenna type: 15cm high sensitivity antennaWireless protocol: ExpressLRS 3.2 pre-installedOutput channel: 4CH PWMTelemetry power: 10mwBattery voltage detection range: DC 4.0- 35VWeight:3.0 gramsDimensions: 30*15*5mmFirmware: Device Category: Radiomaster 2.4Ghz / Device: RadioMaster ER4 2400 PWM RXPackage Includes1 * ER4 2.4GHz ELRS PWM Receiver2 * Heat-shrink tube1 * Voltage telemetry wire Type-A1 * User CardSpecificationER6Item: ER6 2.4GHz ELRS PWM ReceiverPower supply: DC 4.5 - 8.4VAntenna type: 20cm high sensitivity dual antennaWireless protocol: ExpressLRS 3.2 pre-installedOutput channel: 6CH PWMTelemetry power: maximum 100mw LUA AdjustableTelemetry Battery voltage detection range: DC 4.0 - 35VBus interface: CRSFWeight: 14.5 gramsDimensions: 43*25*15mmFirmware: Device Category: Radiomaster 2.4Ghz / Device: RadioMaster ER6 2400 PWM RXPackage Includes1 * ER6 2.4GHz ELRS PWM Receiver1 * Voltage telemetry wire Type-B1 * CRSF wire1 * ELRS- RX- SBUS wire1 * User CardSpecification ER6GItem: ER6G 2.4GHz ELRS PWM ReceiverPower supply: DC 3.5 - 8.4VAntenna type: 15cm high sensitivity antennaWireless protocol: ExpressLRS 3.2 pre-installedOutput channel: 6CH PWMReturn power: maximum 50mw LUA AdjustableBattery voltage detection range: DC 4.0 - 35VWeight: 5.0 gramsDimensions: 42*13*8mmFirmware: Device Category: Radiomaster 2.4Ghz / Device: Radiomaster ER6GSpecification ER6GVItem: ER6GV 2.4GHz ELRS PWM ReceiverPower supply: DC 3.5 - 8.4VAntenna type: 15cm high sensitivity antennaWireless protocol: ExpressLRS 3.2 pre-installedOutput channel: 6CH PWMReturn power: maximum 50mw LUA AdjustableBuilt-in high-precision air pressure sensor VarioBattery voltage detection range: DC 4.0 - 35VWeight: 5.0 gramsDimensions: 42*13*8mmFirmware:Device Category: Radiomaster 2.4Ghz /Device: Radiomaster ER6GVPackage Includes1 * ER6G or ER6GV 2.4GHz ELRS PWM Receiver1 * Voltage telemetry wire Type-A2 * Heat-shrink tube1 * User Card