They work perfectly and know how to program per channel at work. The problem is that they have to be reprogrammed every time you turn them on. Also, they only pick up transmissions at close range, a maximum of 20 or 25 meters. My workplace is 1 story high and less than half a mile in circumference. In addition, they are good, durable, durable, and the battery lasts a long time. With an average usage of 8 to 9 hours per day, the battery lasts up to 2 1/2 days on a single charge.
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