Herdio 4 Inch Flush Mount Wall Ceiling Speakers Compatible with Bluetooth Herdio 4 Inches wall ceiling speakers' flush mount design for simple easy installation in-wall / in-ceiling , or pre-cut speaker openings, for in home use, office, professional, or custom audio applications on any flat surface. What's in the box - 4"HCS418 Speakers(1 PAIR) 2 Speaker Connection Wires 1 Amplifier Box , 1 Power Supply Owner's Manual About this product Compatible with Bluetooth：Independent Digital Amplifier box bring you surround sound effects. allows for wired music streaming ability and doubles as a sound processing digital amplifier. You will be able to stream audio from all of your favorite devices (like smartphones, tablets and computers). FLUSH MOUNT DESIGN - Compact flush mount design for simple easy installation in-wall / in-ceiling , or pre-cut speaker openings, for in home use, office, professional, or custom audio applications on any flat surface. PAINTABLE GRILLS with MAGNETS - makes it e