Party Boost allows you to pair two JBL Party Boost-compatible speakers together for stereo sound or link multiple JBL Party Boost-compatible speakers to truly pump up your party Ready to get your groove on? Pulse 4 delivers up to 12 hours of party time on a single charge Pulse 4 delivers JBL signature sound in every direction with its ingenious 360 degree speaker arrayParty Boost allows you to pair two JBL Party Boost-compatible speakers together for stereo sound or link multiple JBL Party Boost-compatible speakers to truly pump up your party Ready to get your groove on? Pulse 4 delivers up to 12 hours of party time on a single charge Pulse 4 delivers JBL signature sound in every direction with its ingenious 360 degree speaker array