【Works as Central Hub】Working as the central hub of smart home, the HomeBase A3 can connect up to 64 devices (32 sensors + 32 cameras), including PIR Motion Sensor T1C, Open/Close Sensor T2C, Emergency Button T3C, Siren T9C, Water Leak SensorT10C, Thermometer Hygrometer T51C, Smart Radiator Thermostat T55, Smart Door Lock DL01S. With this home gateway, you can check or get notifications about home activities, anytime, anywhere. 【Small Size & 2.4GHZ Wi-Fi】Measuring only 7cm x 7cm x 2.5cm and weighing only 71g, the hub can go virtually anywhere – coffee tables, nightstands, bookshelves, or any other convenient spot. Connect it using an Ethernet cable or through your home 2.4GHZ Wi-Fi, and enjoy a steady performance with peace of mind. 【Get Instant Sound & APP Alerts】When detector is triggered, it will send you an instant app alert and trigger a loud siren over your connected home gateway A3.You can manage, arm, disarm, check activity logs and receive alerts from all your connected sensors via the all-in-one EZVIZ App. The A3 Gateway is the central brain to your EZVIZ sensors, so you have everything in control in the palm of your hand. 【20 Sound Options】Want to choose your own alerts instead of hearing a panic-inducing, ear-piercing siren? The A3 can help. 20 sound options are available to choose from. Customize the alert sounds using your EZVIZ App. You’ll finally find a ring that suits your home’s atmosphere. 【Works with EZVIZ Camera for Video Storage】With the A3, you can expand your security system up to 64 compatible devices. The connected sensor can also link to your EZVIZ indoor pan-tilt cameras for enhanced protection. By using a micro SD card (sold separately) or subscribing to EZVIZ CloudPlay, you can set the linked camera to begin auto-recording for 5 seconds whenever the sensor detects any activity.