Large multi-pack American brand Fydelity has become an indispensable companion of travelers. This model is perfect for daily use in the city, as well as for outdoor activities. The product features a variety of all kinds of pockets, comfortable adjustable shoulder straps which securely hold the shape of the backrest foam sealed by two guides on the chest clip. Inside the two compartments and zippered pocket, there is a small pocket for the power supply and wires for waterproof Hi-Fi stereo speakers with 3 watt amplifier. S / N Ratio: 60 dB. Easily connect your phone, mp3, CD player, iPod / iPad through the 3.5mm stereo jack. Pockets for iPod / iPhone for quick and easy access to your player. Power supply: 4 batteries AA (penlight), for continuous 10-hour sound. Frequency response: 150 Hz ~ 20 kHz. In the dense water-repellent fabric is easy to care for. Excellent choice!