... connect with 10 sensors 4. LCD display Wireless GSM Security Alarm SystemsFunction Instruction:1) Built-in English/Chinese language ... fire, gas, door, hall, window, balcony, and perimeter places alarm;15) Real-time, delay, 24 hours, bypass Defence zones ... rechargeable battery: make alarm when power off.Below Packaging picture for reference: Wireless GSM Security Home Alarm System with LCD Display ...