Feature: 1. BLUETOOTH WIRELESS CONNECTION: This board make the audio input of the power amplifier board realize Bluetooth wireless connection 2. STRONG BLUETOOTH SIGNAL RECEIVING CAPABILITY: Possess strong Bluetooth signal receiving capability(20 meters barrier free connection), bring non destructive sound quality, simple and practical 3. FOR ANDROID MICRO USB INTERFACE: Power input adopt for Android Micro USB interface, voltage is 5V, audio output adopt 3.5mm audio head, easy to use 4. GOOD QUALITY PCB: Adopt good quality PCB materials, with reliability and miniaturization, good maintenance and interchangeability 5. 35X35X8MM SIZE: Appearance size for 35x35x8mm, installation hole distance support 9/17/3mm, very flexible Specification: Item Type: Bluetooth Audio Receiver Board Product Material: PCB Product Model: XH-A250 Appearance Size: Approx. 35 x 35 x 8mm / 1.38 x 1.38 x 0.31in(there is a ±2mm error in manual measurement) Audio Input: Bluetooth input Installation Hole Distance: Approx. 9mm / 0.35in, 17mm / 0.67in, 3mm / 0.12in Audio Output: 3.5mm audio cable output Power Interface: For Android Micro USB Bluetooth Signal Receiving Capability: Approx. 20m / 65.6ft barrier free connection. Package List: 1 x Bluetooth Audio Receiver Board