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Specifications:>>>APP download from here<<<Model: TB21 PROInput mode: Bluetooth + 3.5mm AUX + USB inputInput voltage: DC 12-24V/5A or aboveBluetooth: 5.2Chip: TPA3116D2 chipMaximum output power: 50W+50W+100WApplicable speakers: 20-100W, 4-8ΩSupport APP control: Yes (change Bluetooth name/set password)U disk decoding: WAV FLAC APE MP3Product size: 111x103x27mmProduct weight: 220gColour:BlackMaterial:ABSPackage includes:1 x Bluetooth amplifier board