ITEM NAME:TPA3118 wireless bluetooth audio receiver digital power amplifier module BX Description: Audio input: Bluetooth receiver Supply voltage: 12 ~ 28V DC (direct current) reverse polarity protection 2X45W stereo power amplifier chip TPA3118 Applicable Speaker Impedance: 4,6,8 ohm AUX output: 3.5 headphones on (after the amp for use) Display Bluetooth device name: Xpecial Audio Package Included: 1 x Bluetooth Stereo Audio Amplifier.2X45W stereo power amplifier chip TPA3118. 1 x Bluetooth Stereo Audio Amplifier. Audio input: Bluetooth receiver.