* WIRELESS BLUETOOTH SERISE CONNECTION: TWS function lets you pair 4 speakers for a powerful true stereo surround sound.(the HOST speaker and SUB speaker will automatically link with each other within 6 seconds after you turn on both, simple and easy to use) * FLUSH MOUNT DESIGN: Two pairs of flush mount design 4 speakers for simple and easy in-wall / in-ceiling installation. The product includes the cutout dimension at 8.07 Inches(20.5CM) in diameter x 4.92 Inches (12.5CM) in depth and changeable round grills * HIGH DURABILITY & SUPERIOR SOUND: Wide sound dispersion designed speakers easily integrate with new and existing audio systems, traditional Passive speaker design, simply drive power from your home audio receiver or amp,suitable for bathroom, kitchen, or custom audio applications on any flat surface * EASY TO INSTALL: Includes a cut-out size template & quick connect spring-loaded speaker terminals with spring loaded fixing clips for simple, easy, no hassle installation with included speaker connection wire, bluetooth Controller & power supply * WHAT IS IN THE BOX: 6.5" speakers x 4 , Speaker Connection Wires x 4,Bluetooth Amplifier Box x 2,Power adapater X 2