1、Equipped with recording jack, the two-way voice signals can be output easily. (such as the bank teller system for recording) 2、Both inside and outside have speaker and microphone, the inside and outside speaker can be turned off individually. 3、Easy to use and simple to install, suitable for many occasions like bank, securities, hospital, bus station, etc. 4、Qualified speaker and high-sensitive microphone, the voice is realistic and clear. 5、Volume of speaker and sensitivity of microphone can be adjusted. Description: This system has a qualified speaker and high-sensitive microphone. You can hear clearly. Suitable for many occasions. Come and have a look. Features: Equipped with recording jack, the two-way voice signals can be output easily. (such as the bank teller system for recording) Both inside and outside have speaker and microphone, the inside and outside speaker can be turned off individually. Easy to use and simple to install, suitable for many occasions like bank, securities, hospital, bus station, etc. Qualified speaker and high-sensitive microphone, the voice is realistic and clear. Volume of speaker and sensitivity of microphone can be adjusted. Specification: Brand: Retekess Material: Aluminum Alloy Connection Cable Length: 8m Working Voltage: DC 12V / 500mA Adapter: AC 110-220V, 50/60Hz Main Sound (sub sound): 3W+3W Microphone Sensitivity: -48db 20Hz-16kHz Size: 115 * 145 * 75mm / φ 67 * 20mm Weight: 900g Package Size: 175 * 175 * 100mm Package Includes: 1 * Dual-way Intercom Mic 1 * Speaker 1 * Power Adapter 1 * English Manual 1 * Dual-way Intercom Mic 1 * Speaker 1 * Power Adapter 1 * English Manual