StopWoofer Humane Bark Collar-Dog bark Collar-Anti Barking Collar Small Dogs Medium Large Dogs-Rechargeable Waterproof Anti bark Collar-No bark Collars Sound Warning Vibration Electric Stimulation The set contains two plugs (M) and two jacks (F) of each of the following types: N, UHF, TNC, Mini UHF, SMA, BNC Also contains 6 intermediate couplers Adapter is created by connecting two types of required connectors with intermediate coupler. 30 in 1 creates any possible type of adapter.