Outdoor Speakers for Christmas Gift 1.TF card, Line-in, FM Radio function. ... function in one interface design9. USB high speed transmission10. Applicable to MP3, MP4, Laptop, PC, MD, Mobile phone, etc ... 10%3.Speaker Power4Ω/3W4.Frequency Response150Hz---18KHz5.Signal-to-Noise>80db6.Distortion<0.5%7.BatteryBuilt-in Li- ... Sport Speaker Recommendation: Hot Selling! Outdoor Speakers for Christmas Gift