HYS Dual Band Vehicle Radio 144/430MHz Telescopic Antenna Extension Tube (12.7in)–(19in) VHF/UHF Antenna with PL259 Connector Mobile Antenna Telescopic Antenna NL-R2L(PL259) auspowers_batchfour tech support Can help you

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please be sure to connect the speed controller in front of the forward and reverse circuit regulator (In other words: between the power supply and the forward and reverse circuit regulator) of the children's car

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HYS Dual Band Vehicle Radio 144/430MHz Telescopic Antenna Extension Tube (12.7in)–(19in) VHF/UHF Antenna with PL259 Connector Mobile Antenna Telescopic Antenna NL-R2L(PL259) auspowers_batchfour tech support Can help youHYS Dual Band Vehicle Radio 144 430MHz Telescopic Antenna Extension Tube (12. 7in)(19in) VHF UHF Antenna with PL259 Connector HYS Dual band Vehicle Radio 144 430MHz Telescopic Antenna Extension Tube (12. 7in)(19in) VHF UHF Antenna With PL259 Connector Specification: Connector: PL259(UHF Male) Max power: 100W Frequency VHF&UHF: 144MHz&430 MHz V. S. W. R. Less 1. 5 Impedance: 50OHM Length Approx: 32. 4cm(12. 7); Extendable length Approx: 50. 3cm(19)