Specifications: There is bluetooth-compatible connection password to prevent others from mistakenly connecting and operating, and it is ultra-small size, easy to be embedded in modified products. Two-channel stereo output, it is compatible with most power amplifiers, home audio and video, car audio and other equipment in the market. Standard MICRO MINI USB 5P interface,which is the same for Android phone charging port can be powered by the phone data line. Specific DIY embedded modification pins, which can be plugged in and welded on your own circuit board. It is high-fidelity output circuit, resistance-capacitance isolation, no noise, good sound quality. Wireless plug-in U disk, memory card and button settings, pure mobile phone operation is connected to play MP3. Equipped with 1 status pin, which can be used by professionals, such as combining single-chip microcomputer and relay switch to realize music desk lamp. It can be applied to personal DIY bluetooth-compatible audio, electronic project production, outskirts/car/home audio modification. Item Name: Module Material: PCB Power Supply Voltage: DC 3.7-5V Power Supply Interface: MICRO USB Port or 2.54mil Pin Port Bluetooth Name: BM3 Bluetooth Password for This Batch of Goods: 1688 (You Need to Enter the Password to Connect and Cannot be Modified) Communication Distance: 3-12 Meters (Varies Due to Environmental Barriers) Support bluetooth-compatible Version: Support bluetooth-compatible 4.1 or below Support Mobile Phone System: Android, Apple system Channel: Two Channels Audio Quality: MP3 Lossless Decoding Built-in Power Amplifier: No External Power Amplifier: Not Limited Needle Spacing: 2.54mil Features: bluetooth-compatible 4.1, high clarity Voice, Lossless Sound Quality Size: 3.3cm x 3.5cm x 1.1cm/1.3" x 1.38" x 0.43" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Module