... zones Mobile phone alarm, SOS calling SMS remote control Wireless doorbell & siren alert burglar GSM system Product Introduction: SIMPAL ... make use of GSM network and 433Mhz wireless technology. It can connect up to 16pcs 433Mhz wireless sensor, once sensor trigger, the ... 1PCSManual: 1PCS Advanced Functions:l Work with wireless sensor: It can work with 433Mhz wireless sensors (8 sensor Zones), such as door ...