Features: Support 2.4GHz WIFI (DO NOT SUPPORT 5GHZ WIFI); Support 99 detectors & 99 remote control maximun; Work with Amazon Alexa & Google Assistant; Support 3G/4G micro-sim card(WCDMA B2/B5,FDD-LTE B2/B4/B12); The host only can make calls and send text messages; Support 8 groups of alarm numbers (phone + SMS + CID); Support Tuyasmart app Support 20 RFID cards maximum Share the host to max 20 accounts; Support CID, compatible with international Contact ID protocol; Support 99 zones and 8 zone types optional in each zone; Common calling diretly; Remote control via phone call or sms message; Set delay to Arm or alarm; Low-battery remind; Anti-tamper function; Built-in backup battery.