Comfortable Bluetooth Speaker Backpack silvery bottom surface with two naturals pattern Q-04

Comfortable Bluetooth Speaker Backpack silvery bottom surface with two naturals pattern Q-04 This type bags include standard backpack and bluetooth version. The standard version has the functions of card reader, mp3 radio. The bluetooth version not only has the function of standard version, but also have the feature of bluetooth function that can play music in the phone , remind call dial and freedom to answer. Speaker Specifications: D40mm 3Ω/5W*2 Charge Voltage:5V,3.7V