The StageMate S400D is an amazing portable sound system with built-in digital effects. Ideal for parties, picnics, club meetings, weddings, church gatherings, company functions, sporting events etc., and at just 34 pounds, it's lightweight and easy to operate. Use it with a keyboard or drum machine or as a DJ-Karaoke system. Operates up to 3 hours at 100w on it's internal, maintenance-free, rechargeable 12V no-vapor lead-acid battery, and the exclusive "pulse-width" mosfet power supply generates high output when on battery power or shore power. Features 4 channel inputs for mics and instruments and RCA inputs for tape/CD.