Specifications: Bluetooth 5.0, stable performance and fast transmission. Supports TF card/USB disk playback, so you can play your favorite music. Clear HiFi sound, which can bring you excellent listening experience. Item Name: bluetooth-compatible Audio Amplifier Material: ABS Function Type: 2.0 Stereo Output Power: 50W + 50W Power Requirement: DC 9-24V Bluetooth Distance: 12m at Least (Barrier Free) Bluetooth Version: 5.0 TF Card and amp; USB Disk Decoding Format: MP3/WAV/APE/FLAC Audio Input: 3.5mm Jack, RCA, TF Card, USB Disk, USB Interface (TF Card and amp; U Disk Not Included) Features: HiFi, bluetooth-compatible Connection, Digital Display Size: 11cm x 9cm x 5cm/4.33 and quot; x 3.54 and quot; x 1.97 and quot; (Approx.) Notes: Due to the light and screen setting difference, the item and 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: (Power Cable Not Included) 1 x bluetooth-compatible Audio Amplifier HiFi, bluetooth-compatible Connection, Digital Display ABS bluetooth-compatible Audio Amplifier HiFi, bluetooth-compatible Connection, Digital Display ABS