iOS devices are experiencing module calibration issues. The new update (with fix) will hit the App Store in week 38. Apologies for the inconvenience. 

E-Switch

Product information E-Switch

Technical data
Colour
White
Weight
16 grams
Connectivity
Bluetooth
Voltage
3 Volt
Type of battery
CR2032 (Lithium)
Battery life
2 years *)
Size
50 x 32 x 13 mm
Maximum linkable sensors
10 pieces **)
Signal interval
Once per 10 minutes

*) In general, the batteries last 2 years. Always take spare batteries with you. .
**) The E-Switch modules are packed per 2 pieces.