Waterproof and Portable Design: Our AKD 2108 Portable Bluetooth Subwoofer Speaker is designed for outdoor use and is waterproof, making it perfect for pool parties, beach trips, or any other water-based activities. Its compact and lightweight design allows for easy portability. Long-Lasting Battery Life: With a battery capacity of 18650 3.7V 1500mAh, this speaker can provide up to 4-6 hours of continuous music playback, ensuring that you can enjoy your favorite tunes all day long. Multi-Source Connectivity: This speaker supports various input sources, including FM, USB, SD, MMC, DVD, PC, MP3, MP4, and mobile phone, giving users the flexibility to connect their devices easily. High-Quality Sound: With a frequency range of 60Hz-23kHz and 15W output power, this speaker delivers high-quality sound with deep bass and clear treble, making it perfect for home theater systems or outdoor parties.