World Open Band ISM 900Mhz  |   Regulation Compliance : FCC Part 15, Part 68  |   Number of channels: 100 and 2 slot per duplex Channels  |   Frequency range: 902Mhz to 928 MHz  |   Duplex procedure: Shock Burst TDMA  |   Channel spacing: 250kHz  |   Bit rate: 250 kbit/s  |   Modulation: Encrypted GMSK  |   Frequency Hopping 100/Sec  |   RF Transmission Power: Approx. 50mW ~ 1000mW (Automatic)  |   Voice coding: Own CODEC Shock Burst ADC 8 kbit/s  |   Operating range up to 1000m (LOS)  |   Power Supply: 90V ~250V adaptor  |   Battery 3.7V 1000mAh Li-Poly, 3 days Standby and 10 hours Talk time  |   Dimension 105 x 45 x 15 mm, Weight: 60gm  |   Operating Temperature : -20 ~ 70°C  |   Humidity : 20 ~ 75%  |  

You can dial and communicate between all extensions up to 16 intercoms. Each of the intercoms have two digits number like 11, 12, 13 etc. For using lift hand set, hear the dial tone and then dial required intercom number, then dialed intercom will ring and you can hear the ring back tone, when the person lift the hand set you can communicate. Each intercoms are using different frequency and deferent security code with frequency multiplexing technology. So you can communicate 8 pairs at a time without cross taking or mingling. Also transfer telephone call with dialing facility (optional). Range up to 200m without any cabling on same electrical phase, range up to 2KM on separate single pair parallel cabling. If you are in different phase, you can use our 900Mhz wireless intercom system. or Single core wired Intercom.