Diitao Zk-502C Bluetooth 5.0 Amplifier Board, 100W Dual Channel Audio Amp Board Specification? Input Mode: Bluetooth / AUX Work Voltage: DC 5V-24V (Above 2A) Channel: 2 CH Stereo Output Bluetooth Version: Bluetooth 5.0 Bluetooth Transmission Distance: 50 Ft MAX Power Output: 50W x 2 Terminating Impedance: 4 - 8 Ohm Match Speaker: 50 - 200 watt Work Humidity: 0%~95%RH SPECIFICATIONS ?Work Voltage:DC 9V-24V Above 2A is recommended ?Communication distance:15meter(Without obstacles) ?Match speaker(30W~100W): ? Tip: adequate output power is required when the audio input is sufficient and the power supply voltage/current is sufficient, the relative power will be higher. Different impedance of the speaker will have different output power.In the case of sufficient voltage and current, the larger the impedance of the speaker, the smaller the relative sound power, please pay attention! How to connect the speaker? Step1-Use the screwdriver to loosen the speaker terminals on the amplifier. Step2-Insert the speaker wires. Step3-Install the screws to secure the speaker wires Package Includes: 1. ZK-502C Stereo Bluetooth Power Amplifier Module * 1 2. Acrylic shell * 2 3. 12mm Copper column * 4; 4. 8mm Screw * 8 5. Steel nut, screw mat * 1 6. 20cm power cable * 1; 7. Screwdriver * 1 8. Knob * 1; 9. Heat sink * 1 NOTE: 1.The power amplifier board should be as far away as possible from the WIFI signal (router) avoid signal interference. 2.Remove the film from the heat sink and attach the heat sink to the chip. 3.Recommended power supply voltage DC 9~24V. 4.It is recommended to use a power supply of 2A or higher. 5.Please don?t use too long wires to avoid signal interference. 6.It is recommended to use a speaker above 50W to avoid speaker damage. Product Features ?Adopt TPA3116D2? With AM interference suppression function chip, with excellent sound quality. It ensures that even with high power operation for a long time, THD is less than 0.1% ?Power Supply?2CH Stereo output power 50watt * 2, working voltage range DC5-27V, for 4-8?, 50-200watt passive speakers.It is recommended to use a DC15V-24V power adapter with a current above 2A ?Bluetooth AUX INPUT?Support 3.5mm wired input and Bluetooth 5.0 input. Bluetooth signal distance up to 49ft. With volume control and power switch, Ideal for DIY your passive speakers ?Reverse Polarity Protection?This Bluetooth amplifier board has a bottom plate and a top plate, support reverse connection protection, Over-voltage protection, under-voltage protection, Over-heat protection, Short-circuit protection ?NOTE?Adequate Output Power Is Required When The Audio Input Is Sufficient And The Power Supply Voltage/Current Is Sufficient, The Relative Power Will Be Higher. Different Impedance Horns Will Have Different Output Power.In The Case Of Sufficient Voltage And Current, The Larger The Impedance Horn, The Smaller The Relative Sound Power, Please Pay Attention! Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!