Feature: A 4-channel Bluetooth amplifier is a versatile audio device that offers multiple ways to play your favorite music. With four channels, it provides a powerful output that can connect to multiple speakers, for a full surround sound experience. It also features Bluetooth connectivity, allowing you to wirelessly stream music from your phone, tablet, or other Bluetooth-enabled devices. Additionally, You can also insert an SD card into the amplifier to stored on the card. Additionally, the FM radio function allows you to tune in to your favorite radio stations and listen to them through the amplifier. The USB function lets you connect a USB device to stored on it. Supports Bluetooth connectivity Small size and easy to carry There are four outgoing channels Maximum power per channel up to 60w Perfect for use in the car as well as size: 17 x 10 x 4.5cm Material: Metal colour: black Package Contents: 1 x audio amplifier 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.