A stage piano is a kind of digital piano optimized for stage use by professional gigging musicians. The outputs will have 1/4" L-R outputs perhaps XLR L-R outputs too. The unit will be lightweight and portable, but also sturdy for the impacts that gigging life entails. Sometimes a stage piano will not have any internal speakers for making sound, relying on stage monitors or keyboard amps to make sound. Many models, like the Roland FP30 pictured below will come in a stage version, as well as in a stand with pedals for a stay-home version.