You need 2.4ghz Wi-Fi. And must be WEP, WPA or WPA/WPA2 cryptography. WPA2 won’t work!
Very happy with the purchase. After one week using it, the device and App work well. The pH and temperature measurements are stable. At first I had two problems: I received manual only in Chinese and I couldn't find the app for Android. I contacted with the supplier and quickly he mail me the manual in English and the download link for Android. Shipment took a while, but i received it perfectly.