ITEM NAME:ZK-502T TPA3116D2 Bluetooth 5.0 Subwoofer Amplifier Board 2.0 Channel High P Pf Specification: Product model: ZK-502T Bluetooth version: 5.0 Input method: AUX + Bluetooth SIze:13cm x 8cm x 4.5cm(5.12“ x 3.15†x 1.77") Package include: 1Pcs Amplifier Board.1Pcs Amplifier Board. Bluetooth version: 5.0.