>>AUDIO SPECIFICATIONS DRIVER TYPE : Dynamic FREQUENCY RANGE : 50 Hz-20,000 Hz DRIVERS : - Two 3” 15W woofers - Two 3/5” 10W tweeters - Two passive radiators ADJUSTABLE BASS AND TREBLE CONTROLS : Fine-tune your music using the analogue controls on your speaker MAXIMUM SOUND PRESSURE LEVEL : 87 dB SPL @ 1 m CABINET PRINCIPLE : Sealed with passive radiator POWER AMPLIFIERS : - Two 20 Watt Class D amplifiers for the woofers - Two 10 Watt Class D amplifiers for the tweeters >>BATTERY BATTERY TYPE : Built-in, rechargeable Li-ion battery PLAY TIME : 20+ hours QUICK CHARGING : 20 minutes charge gives 2 hours of playtime CHARGING TIME : 4.5 hours >>CONTROLS AND CONNECTIVITY WIRED CONNECTIVITY : 3.5 mm Input TOP PANEL CONTROLS : Multi directional control knob: play/pause, skip track, volume control, on/off Bluetooth pairing button: connect to your device(s) and activate Stack Mode Battery and volume indicator Treble and bass controls CUSTOMISE SOUND : Yes, on speaker and in app BLUETOOTH RANGE : 10 m/30 ft >>PHYSICAL UNIT DIMENSIONS : - 109 x 230 x 95 mm - 4.29 x 9.06 x 3.74 in WEIGHT : - 1.8 kg - 4.0 lb WATER RESISTANCE : IP67 >>COMPATIBLE APPS APPS : Marshall Bluetooth app