This effective biocompatible device helps to protect against effects from the harmful signals emitted by cellular phones. EasyCall uses patented CMO (Compensatory Magnetic Oscillator) technology, which maintains biological equilibrium and has been scientifically proven to reduce electromagnetic stress caused by these frequencies. Based on studies showing that alpha waves (which the brain emits during meditation and relaxation) enhance the immune system, the EasyCall contains a frequency-imprinted solution that provides similar support, conducting positive energies to the immune system in a biologically friendly manner. Works with Bluetooth. Quarter-sized disc attaches with adhesive backing. Buy 2 or more at a reduced price.