Feature:1. Improve Communication Efficiency: Window intercom loudspeaker can achieve the function of two way microphone, convenient communication and improve work efficiency.2. Clear Sound: Window loudspeaker design makes the sound clearer, avoiding the sound blur and noise problems of traditional window intercom calls.3. Multi Scene: Suitable for a variety of places, such as counters, hospitals, banks, restaurants, stations, etc. meeting the needs of different working environments.4. Space Saving: The window intercom is small and lightweight, easy to carry and install, does not take up too much space, and is more convenient to use.5. Durable: Made of durable aluminum and ABS materials, our window intercom system with high durability and reliability, suitable for long term use.Specification:Item Type: Window IntercomMaterial: Aluminum plate +ABSVoltage: US Plug 110v-240v Frequency Range: 3km-5km (MHz)Theoretical Communication Distance: 3km-5km (km)Output Power: 2w.Package List:1 x Host 1 x Power Supply 1 x Security Kit 1 x Glue 1 x Extension