Summary: I ordered them so I can see the charge level when changing USB devices, which is especially useful if the device doesn't have a charge level indicator (or if it doesn't very much I agree). If the charging current falls below, you will see that the device is almost fully charged. Observations: I have previously purchased a $30 version of Deegoo which has a Bluetooth feature which I have not been able to get working. This version costs $10 less and does not support Bluetooth. This works just as well as the BT version and costs less. Recommendations: Pros: Good fit and finish, display is easy to read. Cons: None. Conclusion: 5 stars for $20, it works well. If you don't need BT functions, this option is recommended. Related products: USB Tester UM25C, Deegoo
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