The Aerpro CBXS 5W UHF CB Extension Speaker is an additional speaker for a UHF CB Radio that has a 3.5mm speaker output. The speaker is useful in situations where the UHF CB Radios inbuilt speaker is not clear enough or if there is too much conflicting noise from the vehicle or surrounds. Easy to assemble, with a convenient size of 100mm (W) x 82mm (H) x 59mm (D) the placement options within your vehicle are not as limited as with some bigger units. The Aerpro CBXS comes with a universal mounting bracket plus a 1.2m extension lead with 3.5mm jack for placing the speaker closer to where the driver can hear.