Send links to other mobile phones using ultrasound. Both phones must have Radon installed.
Locates the devices with Radon using a combination of Wi-Fi, Bluetooth, and ultrasound.
Share with several people at the same time. No need to enter a password or have them in your contact list.
No in-app purchases required. Free
A minimum of 1 MB of free memory space and Android 4.0 or higher.