re signal strength of beacons at 1 m distance
xy: fixed at -59 dBm
tile: fixed -59
USB radius -69 (= can be set, but this is the max )
sanwo with 4 AA batteries default is -66, but can be set (with and android app, no iPhone app)
arriving at my house:
1. the AAA on the dashboard, signal strength at -91 ~ 30 meter away from home, but that depend on if I come from the right or left .. better or worse line of sight
2. 7 secs later parking in front of the house
-xy on the keychain @ -89
- USB beacon @ -93
both no line of sight
so with an ibeacon @ -66 TX power on the front dash board it give ample warning. you can easily open the garage door.
Karl
good explanation of signal strength and how it is measured and distance calculation at https://www.beaconzone.co.uk/choosingthetransmittedpower