One box of 16 units, 17.86kg, 43 * 37 * 38cm   The system has highquality speakers and highly sensitive microphones. Especially with the use of 4core highstrength aluminum foil shielded wire, it has strong antiinterference ability, making the sound clear and natural. The digital full duplex voice intercom communication technology can automatically recognize voice signals during a call without any operation. Suitable for banks, securities companies, hospitals, stations, etc. that install antitheft glass. Features: 1. Adopting aluminum alloy panel, easy installation, simple DIY operation and connection 3. There are speakers and microphones both inside and outside, and the volume and microphone can be adjusted separately 4. The internal and external speakers can be turned off separately 5. The speaker volume and microphone sensitivity can be adjusted 6. Use 4core highstrength aluminum foil shielded wire and secure connection plug 8. Equipped with a recording jack, it can simultaneously output both internal and external voice signals (such as recording for bank teller systems) 9. Can be used in any difficult to communicate place, such as banks, securities, hospitals, bus stations, etc Specifications: 1. Material: Aluminum alloy shell 2. Connection cable length: 1.8m 3. Working voltage: DC12V/500mA 4. Adapter: AC 110V or 220V, 50/60Hz 5. Main voice (secondary voice): 3W+3W 6. Microphone sensitivity: -65db 20Hz-16KHz 7. Host size: 118 x 87 x 45mm Extension diameter67*20mm 8. Weight: 580g