Adopt Bluetooth wireless connection technologyBuilt-in all-digital auto-tuning radio, 30 radio stationsStandard 86 Mounted on the wall for easy controlWith wireless remote controlSupport linkage trigger doorbell inputRS485 integration with third party system(2channel version)High sensitivity 4 inch touch screenSupport audio input and output function with secure and fast connect phoenix connectorsSuitable for homes, commercial areas, kid's room, etc.Output Power: 4x20WOutput Impedance: 4-8ohmT.D.: 0.03%Frequency Response: 20Hz-20KHzAudio S: 98dBMemory Card: up to 32GSize: 86x86x11mmColour:Photo ColorMaterial:ABSPackage Contents:1 x Bluetooth Wall AmplifierOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.