Product not capable of emitting radio frequency energy..HAM Balance Equipment Kits , which can work in the short-wavelength range of 1-30MHz . | It can withstand 100W-200W. It can easily produce high-performance balun to ensure efficient radio transmission and reception. It allows you to fully enjoy the fun of DIY. | 1:1 balun is suitable for bipolar DP antenna (inverted V positive V) antenna such as Yagi (40-100Ω). 1:4 balun for LOOP antenna and Winton antenna (200-400Ω). | 1:9 balun is suitable for long-line antennas, with manual day adjustment or automatic day adjustment. | You will receive the balun kits with the instructions.Or please contact the seller for the PDF instructions. Enjoy.Thank you