... alarm systems with voice speakermain features:1. 8 wireless and four wired ones gsm alarm system2.Two-way to speak with ... can be programmed by users 7. Record 10 seconds message8. gsm alarm system using remote controllers, you can arm, disarm, ... 50mAWireless receiving distance:≥100mOperating Frequency:433.92MHZ or 315MHZ,GSM 900/1800MHZ,Operating voltage:DC12V,AC220/110VWireless receiving distance:≥ ...