Which bluetooth module should I get?

[JoeyZ5]

The small antenna is actually quite small, only around 4-5cm long and 1 cm diameter.

The Definitive Guide to Metr App / Metr Pro

the one i got is 8mm diameter and approximately 44mm long i can’t promise that you’ll get the same antenna with your order. i suspect any 2.4ghz antenna with a u.fl connector will work in it’s place [IMG_20200404_132638] [IMG_20200404_132739]