I tried using only one which resulted in a crash. User error rather than the raw product itself. Luckily I had other options available which I chose. The splicer wasn't big enough for the size of wire I was trying to splice. But it should work for future needs. The large size (yellow) is more suitable than the smaller red and blue plugs. Most of these small parts are out of stock due to the impact of the pandemic and increased demand in the supply chain.