YR-S2 Modules ( S-Series and P-Series Compatible):Default Title Headphone frequency: 20 - 20000

Headphone frequency: 20 - 20000 Hz

and upgradability of device applications to Teams or SFB • Magnet handset • Supports Expansion Module EXP50 • Built-in Bluetooth 4

Up to 1 GSM/3G/4G Channel

It is designed for medium sized businesses

in addition

YR-S2 Modules ( S-Series and P-Series Compatible):Default Title Headphone frequency: 20 - 20000Yeastar S2 Module, 2 FXS Ports. Yeastar S2 module is a module with 2 FXS ports to terminate two analog telephone or fax machines. It is compatible with Yeastar S Series VoIP PBX and P Series PBX System. Port: 2 RJ11 FXS Ports On hook Voltage (tip ring) 48V Supported Model: S412, S20, S50, S100, S300, P550, P560, P570. Off hook Current: 10 mA Ring Frequency: 25 Hz Terminating Impedance Option: 600 Ohm Ring Load: 840 Ohm Max Length Supported: 1500M Loop