JLF building intercom Carrefour, Carrefour visual extension HKM18-18B, the northern supply center - Liu Xuan-ming 1391,1379,647 technical parameters: LCD Size: 7 "TFT Resolution: 800 × 480 Operating voltage: DC18.5 ± 0.5V Environment Temperature: -40 ~ +55 ° C Standby Power: 0.36W Maximum power consumption: 13W audio output without distortion power:> 5mW Frequency response: 300 ~ 3400Hz ± 3db bottom knob to adjust: brightness, contrast / color Dimensions: 245 × 150 × 25 (mm) Installation: embedded wall \ wall mount features: a video intercom, remote, unlock, networking, polyphonic doorbell, surveillance, monitoring and other functions of single-family 4-inch TFT color LCD display, interface cordial , easy to operate the same type of users can each other indoor two-way calling and door host, wall unit, management unit, with surveillance video intercom door machine, wall unit and unlock features 16 classic and Hyun tone opted plug wire interface for easy Users demolition using advanced micro-processor, high integration, the system is stable, more reliable installation and maintenance simple, easy debugging, automatic software update feature