Hello Blaine,
Thanks for writing in.
We are not sure if you are talking about this item.
090816
Please long press button for 3 second, then the time will increase.（please note the time can only increase.
For more question, please fee free to contact us.
Best regards.

Hello richard tate,
Thank you for your message.
Is it this item?
200141
Would you please take a video or some pictures to show how it is? And please tell us some parameters, fore example, measuring voltage/current, load.
You can send pictures to service#droking dot com ( please replace # with @).
Look forward to your response.
Best regards.

Hello Mitchel,
Yes, there is a UART port. you need to connect computerand #200220 with USB to TTL cable.
Best regards.

Hello Andrea，
#200188 can be connect with battery that is less than 12V 20Ah.
Best regads.

Hello Wayne Richards,
Here is a method:
1. Adjust constant-voltage potentiometer to make output voltage reach the voltage value which you want.
2. Use 10A multimeter to measure short-circuit output current (directly connect two meters to output interface), at the same time, adjust constant-current potentiometer to make output current reach preset value.
Best regards.

Hello kevin renfroe,
Thanks for writing in.
To give you an accurate answer, would you please tell us which item your are talking about?
Please kindly send us the ASIN number or product link.
Best regards,
DROK

Hello Haiyan,
We are sorry we don’t have a product that can change its bluetooth by customer.
The bluetooth name for this kind of product is the same.
Best regards.

Hello Bill Caterino,
Thank you for your purchase.
However, we are sorry the wireless range can’t be change.
The only way is to use extend USB cord.
For more questions, please feel free to contact us.
Best regards.