Bluetooth 4.0 digital amplifier module with 18650 battery support Key benefits Wireless audio input: Builtin Bluetooth 4.0 receiver lets you stream audio from smartphones, tablets, or other Bluetoothenabled sources without extra wiring. Long runtime with removable cells: Supports standard 18650 rechargeable batteries for extended use and easy battery replacement. Reliable performance: Engineered under strict standards and precisioncrafted from quality materials to deliver consistent, stable amplification. Simple installation: Designed as a userfriendly amplifier board that installs without complicated procedures or special tools. What it does and why it matters Function: Acts as a compact digital amplifier board with an integrated Bluetooth 4.0 receiver, converting wireless audio into amplified output for speakers or other audio stages. Compatibility: Works with devices that support Bluetooth 4.0 or later and uses common 18650 cells for power, making it compatible with widely available batteries and audio sources. Build quality: Manufactured with durable, quality components and precision assembly to reduce noise, improve longevity, and maintain performance over time. Ease of use: Straightforward wiring and mounting mean faster integration into projects and repairs, reducing setup time and technical complexity. Typical applications DIY portable speakers: Add Bluetooth streaming and battery power to custom speaker builds using 18650 cells for a rechargeable portable solution. Audio upgrades and repairs: Retrofit older amplifiers or speaker systems with a modern wireless input without replacing the entire system. Outdoor or mobile audio: Power small sound systems for outdoor events, workshops, or mobile installations where mains power is unavailable. Technical notes Includes a Bluetooth 4.0 receiver on a digital amplifier board. Supports standard 18650 batteries for power; battery holders or wiring should match 18650 cell specifications. Built with quality materials and precision assembly for durable, longterm operation. Installation is simple and does not require particularly complicated operations.