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After observing remarkable 100 meter performance between the Apple iPhone 7 and Bluetooth Class 1 Beats Solo3 Wireless, we decided to compare the Bluetooth performance between the iPhone 7 and the Bluetooth Class 2 Otium Wireless Sports Earbuds. 

The connection between the iPhone 7 and Otium Wireless Sports Earbuds is very stable up to 20 meters. After that distance, the Bluetooth connection becomes disrupted and not really usable especially if you are moving around.  Bluetooth Class 2 devices should work up to 30 meters so this performance isn't surprising.