Compatibility: - Compatible with hand-held walkie talkie with output power 2W-5W. Installation: - It can be installed in driver's cab or trunks. Please leave some open space for the heat sink and fan.Package Included: - 1 x Walkie Talkie Power Amplifier. Usually it costs about 30USD-50USD. If you receive the item that not satisfied or defective, please do not open case and kindly notify us within 30 days.