Cardioid pickup pattern delivers warm, clear, and crisp vocal sound designed to make voices sound their best over any JBL PartyBox Shock mount system minimizes sound when passing the mic from one hand to another, and a built-in pop filter eliminates extraneous breathing sounds Just plug in and start singing, making it easy to use Compatible with all JBL PartyBox speakers, so you can use these mics with any model Stable 2.4GHz connection with the digital wireless dongle within 30 metres of the PartyBox Rechargeable battery lets you keep using the mic while it charges on a PartyBox speaker’s charging port; 10 minutes of charging provides two hours of play time Up to 20 hours of play time, with up to 12 hours of play time when using the digital wireless dongle, depending on usage