Specifications:

Impedance:8 Ohm
Frequency Response:60Hz-20kHz
Environmentally Friendly ABS Construction
Prefect for Custom Installations&Applications
Size/Dimensions
Total Speaker Diameter:8.46 inches(21.5CM)
Cut Out Diameter :7.3 Inches(18.5 CM)
Speakers Depth:4.33 Inches (11 CM)
Advanced 5.0 BLUETOOTH Technology：Independent Bluetooth Digital Amplifier box bring you stereo sound effects. allows for wireless 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).
300-Watt Peak Power:300 Watts Total Power Output per Pair (150 Watts Each Speaker)
Flush Mount Desgin：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.
Mounts on Wall /Ceilings:Total Speakers Diameter 8.46 Inches (21.5 CM),Cut Out Diameter 7.3 Inches(18.5 CM),Speakers Depth: 4.33 Inches (11 CM)

What's in the box:

5.25" speakers x 2 ,

Speaker Connection Wires x 2,

Bluetooth Amplifier Box x 1,

Power adapater X 1