Item Name: Amplifier Board Material: Plastic Model: H1 Input Voltage: Wide Voltage 8-36VDC, Ac Input Is Not Allowed Bluetooth-compatible Chip: Mountain View Bp1048b2, Bluetooth-compatible 5.0 Bluetooth-compatible Decoding Format: SBC, AAC Bluetooth-compatible Distance: 15 Meters U Disk Decoding Format: Mp3, WAV, FLAC, APE Bit Rate Should Be Less Than 1500kbps. Microphone Interface: Dual 6.35mm Microphone Interface Power Interface: DC5.5-2.1 Female Socket, or Terminal Block, Second Choice Audio Output Interface: 3.5mm Headphone Holder, or XH2.54-3p Socket, Second Choice Working Mode: Bluetooth-compatible, AUX, U Disk/Sound Card Indicator Status: The Blue Light Flashes Slowly in USB And Aux Modes And Stays on When The Bluetooth-compatible Connection Is Successful And Flashes Super Slowly When There Is No Connection. Start TWS, The Red-Light Flashes to Search for Pairing, The Red Light Is Always on for The TWS Left Channel, And The Red-Light Flashes Slowly for The TWS Right Channel. Mode Priority: Bluetooth-compatible Can Be Intercepted by Inserting A USB Flash Drive or Aux, And The Mode Can Be Remembered After Power Off. Bluetooth-compatible Is Not Available in USB Flash Drive or Aux Mode. Weight (Version with Case): Including Packaging 169g, Net Weight: 134g Weight (Version Without Case): Including Packaging 117g, Net Weight: 80g Features: Bluetooth-compatible, Easy Connect, Professional Size Details: L: 12.2cm, W: 8cm, H: 2.26cm(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Microphone Amplifier Board