The bold, bass-filled sound of Altec Lansing HydraBoom Speaker's four 1.5" drivers, one 2.5" woofer, and a passive radiator give you more bass than you can handle. Your music, your preference: vertical or horizontal settings allow you to receive either stereo music or 360-degree omnidirectional sound. Mounting Details: Portable; Connector/Port/Interface: Bluetooth; Lightening: Micro USB; Qi; USB-A; USB-C; Depth: 4.3"; Drivers: (4) 1.5" Driver; (1) 2.5" Woofer; (1) Passive Radiator.