Almost drains no battery, no traffic when screen is off.
Default pings 220.127.116.11 every 3 seconds, about 2 KB/min traffic when screen is on. You can change these settings.
Icon is from http://www.rubysoftware.nl/
Copyright 2011 Robot Media SL (http://www.robotmedia.net)
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0