Tuya 2.4G WiFi 4G GSM Siren Alarm Door Window Sensors Smart Home Security System
This alarm hosts for all GS-103 in this link are all WIFI （2.4Ghz） & GSM（4G） GPRS versions. GS-103 tuya. Siren output. 【QUICK & EASY INSTALLATION & REMOVAL & NO MONTHLY FEES】-- No monthly fees, installation costs or contracts required.