The HX31 is a low power ultrasonic RFID position transmitter. It emits identity with both 2.4Ghz traverse waves and ultrasonic longitudinal waves. This transmitter is good for long range positioning up to 16 meters. There is an option for internal fixed or rechargeable battery, charged through a micro-usb socket provided. Some versions come with internal 3V battery. Battery lifetime is in terms of months to years, depending on the usage and sleep modes. Wireless 2.4Ghz bi-directional communication, provide access to the internal command system and the hx19 network. XYZ coordinates for this transmitter externally computed for autonomous navigation, can stream through the micro-USB serial (pin) channel at 16s/s.