GSM 900MHz (transmit 890-915MHz / receive 935-960MHz) / GSM 1800MHz (transmit 1710-17850MHz / receive 1805-1880MHz). dual band: GSM 900MHz/1800MHz. quad band: GSM 850/900/1800/1900MHZ. It can be connected to the market with voice box, burglar alarm host, ordering software.
eBay