Features: Upgrade your auditory experience with the 86B bt4.0 Stereo auditory Module, featuring advanced bt4.0 technology for low energy connectivity and 24bit/48kHz auditory resolution that delivers clear sound quality. Designed with a compact 32mm x 32mm PCB structure, this wireless loudspeakers amplifier module integrates bt4.0 chips for 10 meter wireless ranges, 3.5 stereo input/output ports, and five key controls for seamless device pairing and auditory customization. Ideal for audiophiles, electronics enthusiasts, and intelligent home users seeking professional wireless auditory transmission for loudspeakers, car stereos, or home theater systems. Enhances your living room entertainment, workshop projects, or on the go music streaming with stable bt4.0 connectivity that resists interferences in crowded wireless environments. The plug and play design automatically initializes in 5 seconds, reconnects to paired devices instantly, and supports 3V 5.5V power input for flexible integration into auditory systems or commercial loudspeaker upgrades. Specifications: Type: bt4.0 auditory Receiver Module Chip: CSR8630 Component: PCB Color: White Size: about 30x30mm/1.18x1.18in Package Includes: 1PC bt4.0 auditory receiver module note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.