This product is a versatile Bluetooth audio module designed for DIY mono amplifier projects. It includes a builtin boost circuit, making it easy to upgrade or create batterypowered outdoor speakers, pullrod speakers, and portable speakers with enhanced output. Key features and benefits Builtin boost circuit for improved audio performance in compact DIY amplifiers. Ideal for upgrading existing speakers or building batterypowered outdoor, pullrod, and portable speakers. True wireless pairing for stereo expansion: pair two units to form left and right channels, delivering more spacious and accurate stereo imaging. Robust protection for reliable operation: input reverse connection protection, overtemperature protection, overcurrent protection, short circuit protection, and antistatic protection. App driven and control: connect via app to rename Bluetooth, set a password, adjust prompt volume, enable or mute on/off prompts, use sleep music mode, and perform firmware upgrades. What makes it stand out Practical, DIY friendly: straightforward integration into small enclosures and simple projects, with a builtin boost circuit to maximize performance without additional modules. Flexible use cases: supports mono amplifier upgrades, portable and outdoor speaker builds, and stereo expansion through wireless pairing. Safe and dependable: builtin protections reduce risk of damage from miswiring, overheating, or electrical faults. Easy and updates: app based features allow naming, security settings, audio prompts, and firmware updates for future improvements. Specifications and capabilities emphasized Function: builtin boost circuit for mono amplifier builds; compatibility with Bluetooth audio sources; supports true wireless stereo pairing when using two units. Protection: input reverse polarity, overtemperature, overcurrent, short circuit, antistatic. App features: rename Bluetooth name, set password, adjust prompt sound volume, toggle on/off prompt sound, sleep music mode, firmware upgrade. Applications: DIY mono amplifier projects, batterypowered outdoor speakers, pullrod and portable speakers, and stereo setups using two units. Use scenarios Scenario 1: Build a compact DIY mono amplifier for a portable speaker. Install the module in a small enclosure, leverage the builtin boost circuit, and connect to your speaker driver for enhanced output without extra modules. Scenario 2: Create a batterypowered outdoor speaker system. Use the module to drive a weatherresistant enclosure, taking advantage of the boost circuit for better sound and the app for convenient Bluetooth naming and security settings. Scenario 3: Expand to stereo with two units. Pair two modules wirelessly to produce left and right channels, delivering improved spatial positioning for music, movies, or games, while using the app to finetune prompts and firmware updates as needed. Notes This description reflects the product's core functions, compatibility, performance, and protection features as specified. No additional features or details beyond the original specifications have been added.