Update README.md

README.md

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 # XCTRACK_vario DO IT YOURSELF !
 USB variometer for XCTRACK base on ms5611 high precision pressure and temperature sensor and LK8000
+Also support Bluetooth now as a option !
+
+Power consumption ~ 0.1W 
 
 Based on Arduino Vario by Benjamin PERRIN 2017 / Vari'Up
 Based on Arduino Vario by Jaros, 2012 and vario DFelix 2013
@@ -8,7 +11,8 @@ https://github.com/LK8000/LK8000/blob/master/Docs/LK8EX1.txt
 parts :
 - arduino nano with ftdi chip ( or ch340g chip since xctrack 0.9.3)
 - ms5611 pressure and temperature sensor
-- usb mini - micro - type c OTG cable, depends on your phone
+- bluetooth module in option ( hc-05 or hc-06 or cpp module )
+- usb mini - micro - type c OTG cable (if USB mode) , depends on your phone 
 https://my.aliexpress.com/wishlist/shared.htm?groupId=100000009108834
 
 - PLA box 3D printing