The Billion SG600 R2, 3G Wireless-N Smart Energy ZigBee Gateway, is a TCP/IP based 3G/ZigBee/Wi-Fi appliance designed for users to enjoy real-time power management. Integrated with ZigBee wireless technology, the SG600 R2 can communicate wirelessly with Billion ZigBee-enabled smart device, like SG3015 series meter, SG110-A Temperature / Humidity sensor, SG200 lighting controller etc.