4 Inch 20w Touch Screen Bluetooth Sound Amplifier Board Mini Size HiFi Stereo Preamplifier Ceiling Speaker Kit Home Audio System

4 Inch 20w Touch Screen Bluetooth Sound Amplifier Board Mini Size HiFi Stereo Preamplifier Ceiling Speaker Kit Home Audio SystemSPECIFICATIONS: 4Channel Smart Home Audio Bluetooth Wall Amplifier Specifications:● Power: AC220V(50HZ) allow 110V-250V● Main screen size: 4 inch HD screen ● Output Power: RMS 4x20W● Output Impedance: 4-8Ω● T.H.D.: 0.03%● Frequency Response: 20Hz-20KHz● Audio S/N: 98dB● Expand TF card memory: 32G● USB: 0TG USB function, 32G can be read● Size: 868611mmFramless Stereo In-Ceiling Speaker Mini Size Specifications:● Power 10W● Input: 8Ω● Speaker Unit: 4.5''x1● Sensitivity (1W/1M): 89dB ± 3dB● Frequency Response: 100Hz-16KHz● Material: plastic frame + iron mesh cover● Installation Cutout Size: Φ148mm● Dimension: Φ160x56mm● Net Weight: 0.42KG PACKAGE INCLUDED: Package included depends on which type you purchased. 1. 1 x smart touch screen on-wall amplifier4 x ceiling speaker1 x mounted box1 x remote control1 x bracket and screw2. 1 x smart touch screen on-wall amplifier6 x ceiling speaker1 x mounted box1 x remote control1 x bracket and screw3. 1 x smart touch screen on-wall amplifier8 x ceiling speaker1 x mounted box1 x remote control1 x bracket and screwNOTES: ● In some country, the FM Radio Function may not works well, because the signal may be affected due to different frequencies in different countries and regions.● Languages only support English and Chinese, please check before your purchase.● For this device, speaker cable and power cable is not included. ① Use exceed 150-core pure copper speaker cable to connect speakers. Click to get:200 core https://www.aliexpress.com/item/4000938426917.html100 core https://www.aliexpress.com/item/1005001859469936.html② Use power cable cord as the amplifier request (two cord).● If there is any questions about the product or you need our technical support, please contact us.● Video Playlist:  https://youtube.com/playlist?list=PLo58qiwgS__woxhjGV9BWnr_wl9zyXfqIConnection Guide    https://youtu.be/G7mWynbcC3Q1 How to connect antenna with the wall amplifier    https://youtu.be/YRYsBwAUYhw2 How to use FM function 2    https://youtu.be/GHbV33zwiwY3 How to connect with phone via Bluetooth    https://youtu.be/0QuwVKs4dHQ4  How the wall amplifier controls and be controlled by the phone    https://youtu.be/cEZJtBWBu8I  FUNCTIONS:1. Timed message: set the time to automatically play the message content2. Support power on automatically play songs3. Power-off memory function: remember the state played before the last shutdown4. Sound function: support ordinary, rock, classical, jazz, pop and other sound effects5. Support trigger doorbell function, DB+GND6. Support linkage trigger to play music, GND+ trigger playback7. Support linkage triggering boot, GND+ trigger playback, expenditure trigger shutdown, GND+ timing output8. Supports timing output level signal linkage with other devices, GND+ timing output9. Time switch machine, custom timing boot songIn Wall Amplifier Instructions: 1. Speaker: Speaker wire (200 cores). RVH2X100,RVH2X200 connect to SPK R+ SPK R-.2. Audio output wire: Audio wire (three core shielded wire: commonly known as microphone wire). RVVP2X0.5, RVVP2X0.75 connect to OUT R +OUT L+GND. Can be connected to other amplifiers.3. Audio input wire: Audio wire (three core shielded wire: commonly known as microphone wire). RVVP2X0.5, RVVP2X0.75 connect to AUX L+AUX R+GND.4. Video output: Connect to GND+ATV for video output.5. Trigger the doorbell: Connect to GND+DB to trigger the doorbell.6. FM: Radio antenna7.USB: External OTG USB, can read U disk with adapter.8.TF card: Read TF card interface.9.Power switch: long press for 2 seconds to turn on, long press for 2 seconds to turn off,  short press for lock screen / unlock.10.Volume down key11.Volume up key12.Microphone13.Power supply terminal: Connect AC110V-240V power supply. Click to Visit our Home Page~!