Full patch processWide range of operating voltage supply reverse protection audio output terminalExternal antenna (for mounting inside a metal box)BT Bluetooth module V1.1Input voltage: DC5V-35VBluetooth version: 4.2Working temperature: -40 C to 85 CPeripheral size: 55*32*9 (length * width * height) (mm), can be used in combinationLED indicator:Flashing: waiting for a connectionSlow flashing: audio playbackSteady on: connectedColor: blackmaterial: plasticPackage contents: 1* moduleOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.