1. Advanced electromagnetic interference (EMI). Electromagnetic Compatibility (EMC).2. SpeakerGuard protection circuit system. DC detection circuit and output stage protection.3. The TPA3110D2 can drive stereo speakers as low as 4Ω. More than 90% efficient when playing music4. The output is fully protected against short-circuit to VCC and output to output.5. Both short-circuit protection and thermal protection contain automatic recovery. Stereo lossless Bluetooth module plus noise reduction board to the ultimate effect.Product Name: 2.1 Channel Bluetooth Digital Amplifier BoardSupply power: DC8-20VCurrent: more than 3ASpeaker: 4-8 OhmOutput power: 15W*2+30W (bass)Channel: 2.1 channelsModel Number: TPA3110Type: Home Amplifiercolor:As shownMaterial:PC+MetalPackage Contents:1 x Audio Amplifier BoardOnly the above package content, other products are not included.Note: Light reflection 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.