Description:The Bluetooth-compatible amplifier has high-speed and stable transmission provided by the Bluetooth-compatible 5.0 version.With button control, there are control up and down music, volume increase and decrease, play, pause, switch machine, etc.Made of premium PCB material, the power amplifier board is durable to use.The length of this product is 7cm, the width is 3cm and the height is 0.5cm.Power amplifier board can be used for audio speakers, home theater, loudspeaker, and so on. It needs micro 5p interface power supply, and ordinary mobile phone charger 5V2A charging cable can be used.Item Name: Power Amplifier BoardMaterial: PCBColor: Black, Blue Product Parameters: 4 ohms 2x5W Power Interface: Micro 5P (Reserved 2.5mm Welding Port, this Model does not Support Battery Power Supply) Input Voltage: 3.7V-5V Signal to Noise Ratio: 90DB THDandN: -70DB Crosstalk: -86db DNR: 91db Transmission Protocol: A2DP or AVCTP or AVDTP or HFP Transmission Distance: about 10 Meters (the Shorter the Distance, the Better the Stability) Output Interface: 3.5mm Stereo (Reserved Welding Points, You can DIY by Yourself) Speaker Output Port: 2 Groups Features: Sensitive, Class D, HiFiSize Details: 7cm x 3cm x 0.5cm or 2.76" x 1.18" x 0.2" (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.2 groups speaker output port (one set for each of the left and right channels), which cannot be used at the same time as the headphone jack. When the headphone jack is connected to the headphone, the device will automatically switch to the headphone output and stop the signal from the speaker output port of the power amplifier board.Product Usage:The Bluetooth-compatible audio signals of mobile phones, laptops, and tablets can be received through this Bluetooth-compatible to the stereo amplifier output. The audio interface can also be connected to ordinary headphones with a 3.5mm interface, and ordinary headphones can be turned into Bluetooth-compatible headphones (without microphone, no chat support).Package Includes:1 x Power Amplifier Board Note: 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.