Some use RCA for line level, others use 1/4", or combo XLR-1/4" inputs, with the capability of handling instrument impedance as well as line level and mic level. There was one nice-looking mixer with ...

Coming in at a MSRP of $129.99 doesn't make it the cheapest mixer on the block, but it comes in with a solid performance with ease of use. The K3+ has two input ports for XLR and TRS microphone types.