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I have a chinese smartwatch, called GV30, I think they all are similar ( so it may be similar to a more common u8 ) . The bluetooth connection is very low and weak, it reaches barely 1 m from phone before disconnecting ! I don’t know if it’s a manufacturing defect or it’s a lack of chinese-made, but i want to improve it. I have no warranty, but I am thinking about to repair myself, maybe improving antenna’ s lenght or replacing bluetooth module. What do you recommend me ?

Hi, It probably only has a Class 3 Bluetooth module in it, (effective range -up to 1 metre dependent on what barriers are in the way). Putting a longer antenna on will not solve it, because range still depends on the transmission power output of the module. Replacing it with a Class 2 module (up to 10 metres) might be difficult because you have to find one which : a) will fit, b) has the same connections c) does not draw too much more power from the battery (which it will just to get the increased transmission range you require), as this may compromise the functioning of the other components in the watch, Here is an table which shows the power specifications of the various Bluetooth classes.

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