The datalogger/battery unit contains the storage memory for the tag detections and a rechargeable lithium ion battery pack. This is charged by a 5V power supply (USB) and is connected by a mini USB connector. The standard pre-set polling rate is 0.2ms, however on the latest firmware versions this polling rate is user configurable. Please see the user guide for further guidance on how the polling rate can be changed. Changing the polling rate can be useful and will affect battery life with more frequent polling causing the battery to drain more quickly.