This depends somewhat on your lifestyle. Since you carry your cell phone everywhere and your WiFi router is always active, these are likely the two most powerful EMF radiation emitting devices in your life, therefore, we recommend the Harmonizer+ for your phone and the Harmonizer Ultra for your Wi-Fi router. A wearable product like a bracelet, wristband, or pendant necklace is an ideal choice because it will protect you from all EMFs wherever you go. And since we all spend a significant amount of time at home, we always recommend the EMF Harmonizer Home & Office.