Power amplifier chip: rt7498e Protection mechanism: anti-reverse connection, undervoltage, overheating, overcurrent, short circuit protection Widely used Long-life ultra-quiet fan (blocked rotor does not burn, no noise) Simple to use and easy to understand Product name: 2.1 channel Bluetooth audio amplifier module Product model: -HT21 Bluetooth version: 5.0 (unobstructed, 15 meters) Amplifier chip: TDA7498E Input method: AUX + Bluetooth + USB (wheel button to switch modes and songs) Number of channels: 2.1 channels (left channel + right channel + subwoofer) Adaptive power supply: DC15-36V (undervoltage protection below 9V, also supports 12V power supply) Adaptive speakers: 30-200W, 4-8Q Output power: left and right channels less than equal 160W subwoofer less than equal 220W Product size: 145x126x28 (mm) The appearance and printing of the product from batch to batch, but it not affect the use. Screwdriver colors and styles are random and cannot be specified. Color:As shown Material:Metal Package Contents: 1 * Amplifier Module 1 * screwdriver Only 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.