... surface facilitate outdoor, indoor use;2, Built-in Hi-Fi high-quality and high efficiency speaker, monomer, ... to radio, it will automatically turn off the loudspeaker, not accessible to anyone else.5, Headset, ... audio source to amplify the power. Product Specification:1,Loudspeaker output: THD+N=0.15% @ 1.5W ... 32Ω3,Play time: 10-22 hours with loudspeaker(depend on the volume); 70 hours with earphone4, ...