Key benefits Simple, onekey control for play/pause, track switching, power on/off, and mode entry, enabling quick, intuitive operation. Flexible stereo expansion by pairing two units to create left and right channels with strong spatial positioning, ideal for DIY projects. Wide compatibility and versatile inputs ensure you can source audio from multiple devices with ease. Builtin boost circuit supports DC power from 9 to 24 V, making outdoor and batterypowered applications practical. Key features and specifications Multifunctional key control: onekey play/pause, switch tracks, turn on/off, and enter mode for straightforward operation. Powerful box function: two units can be combined to form a leftright stereo pair with enhanced spatial imaging, suitable for doityourself configurations. Efficient connection: wireless transmission distance up to 15 meters; supports Bluetooth (BT), AUX input, USB drive (U disk), and USB sound card for diverse audio sources. Builtin boost circuit: compatible with DC 924 V power supplies, designed for outdoor and mobile speakers powered by batteries. Compatibility and inputs Wireless and wired options: Bluetooth connectivity plus wired AUX input for nonBluetooth devices. USB support: USB drive and USB sound card compatibility to expand source options. Stereo pairing: two units can be linked to deliver stereo output. Power, performance and durability Power range: DC 924 V compatibility enables use with a variety of portable power setups, including batterypowered systems. Performance: builtin boost circuit provides stable operation across supported voltages, suitable for outdoor and mobile applications. Use scenarios DIY portable speaker system: pair two units to create a compact left/right stereo setup for a custombuilt speaker enclosure, with easy onebutton control for the user. Outdoor events or street performance: connect to a Bluetooth source from a phone or portable device, feed audio via AUX or USB, and operate with a batterypowered DC supply for extended use; 15 m wireless range helps reduce clutter. Home studio or computer setup: use USB sound card or USB drive for flexible audio input, and cycle through tracks or modes with a single button for quick testing and playback.