Hifi Bluetooth Power Amplifier Board Stereo - 2X220W 350W Bluetooth 5.1 Audio Product Features ?HI-FI Stereo?High quality 2.1 channel 220W+220W+350W Bluetooth 5.1 power amplifier board. With AUX, Bluetooth, U disk, USB sound card a variety of audio input methods. With two output modes of active and passive speakers, you can enjoy the music you want anytime, anywhere [New upgrade] The Bluetooth 5.1 power amplifier board supports APP control, and you can modify the Bluetooth name and password settings. The 5.1 Bluetooth version has settings such as adjustable sound volume, turn on/off sound, and timed shutdown. Comes with 10 natural sleep songs, up to 1023 sound combinations. Not only can you display the playlist of the USB flash drive, but you can also shake the phone to change songs or use the dial/mode button to switch songs ?TPA3251D2 power amplifier chip?The power amplifier board uses 2 TPA3251D2 chips from Texas Instruments. It is a high-performance class D power amplifier, which has class D efficiency and can bring true high-end sound quality. The device features an advanced integrated feedback design and proprietary high-speed gate driver error correction. This technology enables the device to maintain ultra-low distortion across the entire audio frequency band while delivering high-definition sound quality ?Super Compatibility?5.1 Bluetooth version, higher transmission efficiency, more stable, and longer transmission distance. In open spaces, the wireless range is up to 15 meters (49 feet). Can be widely used in various devices such as tablet computers, PCs, TVs, smartphones, notebook computers, etc ?Safety Protection?The amplifier board has short circuit, overcurrent, overheating and anti-static protection to prevent complete failure. When overloaded, the device reports a fault condition to the processor to protect itself from damage 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!