Homdox 4.0 Wireless Bluetooth Waterproof Speaker, Red 7.4V, Built-in 2200mAh*2 Lithium Battery. 714g---Net weight up to 714g to ensure stable under max volume. Auto Sleep---Auto sleep within 15 minutes for energy saving. 16 coil of dual magnet speaker---16 coil of dual magnet speaker is applied ensure a stronger high-density magnetism, larger power comparing with same space of speaker, lower frequency, less distortion and more full the voice. Big Buttons Easy Operation & Bilateral control---The speaker features the function buttons, you also can control the buttons from your Bluetooth devices. Bluetooth 4.0 & Hi-fi with 5WX2 speaker---Bluetooth Chipset 4.0, low power consumption, stable transmitting and high compatibility. Compatible with all Bluetooth-enabled playback devices.High quality, Hi-fi with 5WX2speaker. Overwhelming with powerful, dynamic and vivid stereo sound. Lifetime Guarantee - Buy with absolute confidence thanks to our 100% money back lifetime guarantee.