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Absolute Gadget useful for recreational and hobby! I-can-I-positive-opinions-just-here-connect-. 9,7km-are-already-confirmed! Ort-in-der-Elbmarsch-am-Deich-höhe-Freiburg-an-der-Elbe-in-flachem-ebenen-Gelände-keine-Berge-und-freies-Feld. No obstacles between the two devices. Communication was at this distance without any interference. I think there is still got something more. The other side, in densely built environment was closing sometimes even after 500 meters. Remedy created, directed antenna in the direction of the second device, occupy a higher position if possible and exploit the gaps between the buildings. So you have to try some rum and whine not equal to zero because of range and so on. In this way several kilometers in are possible. Practice creates masters. Exactly in the same forest. Quick is the device on its borders often after a few hundred meters. Again Helps elevated position, align antenna, wooded areas, trails and glades looking for then it works again with the connection. Miracles can this device do not accomplish to be quiet even mentioned here, stay tuned and work a lot with the machine and gather experience. Thus squeezing out the maximum. Those who want even more complete amateur radio examination and classified in these circles. Who needs it ..... Here's what you do not get for the money and I think that's important. There is no state of the art lithium-ion battery, let alone Top Lithium Polymer battery! Only an outdated NIMH is. Although this does a good job, a whole day he keeps well even if you have been a little more communicating than necessary but it also means memory effect, fast self-discharge, a mere power on the colder days of the year and fast voltage drop when the battery in the direction capacity transmission goes. The charger is almost an impertinence, 14 hours charging time according to the manufacturer for a 600mAh battery!?! Without Words. Also, it does not indicate when the battery is full. An automatic shut-off is also nil. I'll be switched to Sanyo Eneloop cells. Top performance even in winter, 950mAh promise neat endurance, so do not use hardly any self-discharge immediately ready for use even after six months. And for little money there is good intelligent chargers for it. All in all, highly recommended this "spark". Robust even in sports like mountain biking, in the rain, dust and wen`s times it gets dropped forgive this depending on case type also. Battery and charger would be better I would five stars.