Reverse polarity
Easy installation
Displaying signal strength
Supports Mini-PABX to connect with GSM
Provide feedback signal for payphone
Lock SIM card
Support calls forbiddance for incoming and dialing
Internal or external antenna
Using professional wireless quad-brand module 850/900/1800/1900mhz
Discount available for large quantity
Minimum order quantities is 500-1000 units
Order Quantity delivery time: Within 15-20 days
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