ITEM NAME:Motorcycle Radio Speakers System Handfree High Quality MP3 Amplifier System Description: This amplifier can be connected to any gps, phone, mp3 player. Clear FM signal reception with included waterproof antenna and usb slot. External antenna jack for FM signal transmission and reception. USB & SD Slot input, 3.5mm AUX input for playing audio. FM frequency, USB, SD input. Full function wired remote control. Specification: Material: Plastic Size: 9.5cm x 7cm x 1.6cm Package Includes: 1 piece of lead engine 1 pair of speakers Note: Please connect us firstly if there are any problems with this product. The item's color may be slightly different from the pictures due to the light and screen setting difference. Please allow slight dimension error due to manual measurement.Thanks for your kindly understanding..External antenna jack for FM signal transmission and reception. Clear FM signal reception with included waterproof antenna and usb slot. 1 pair of speakers. The item's color may be slightly different from the pictures due to the light and screen setting difference.