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 easy to attach or remove for quick installation. The large mounting clamp with non-slip tread grips ceilings or walls firmly for sure installation. No need for expensive professional installation 160WATTS MAX POWER - ceiling speaker system were carefully combined to reproduce sound clearly with outstanding responsiveness. The polypropylene cone with rubber edge will help extending the life of the product perfect for custom audio applications MOUNTS ON WALL/CEILING - Total Speaker Diameter - 6.4 Inches (16.2CM).Cut-Out Diameter - 5.7Inches (14.5CM).Total Speaker Depth - 2.6 Inches(6.5 CM).Mounting Depth - 2.6 Inches (6.5CM ) Specifications - Speaker Size：4 lnch Max Sensitivity - 89db Impedance - 8 Ohms Frequency Response - 60-20KHZ Maximum Power Handling - 160 Watts Package： Ceiling Speaker X2 Power cord X2 Power plug X1 Amplifier Box X1 Manual X1