The new developed BOX has a buildin dual band module that works in both of 850/900/1800/1900MHz mobile phone networks. The powerful inductive coil will creat strong signals to drive earpieces within 30-80cm distance. 35db top sensitive microphone ensures your partner hear the whisper voices, even the BOX is hidden under the clothes. Enhanced Privacy Enjoy enhanced privacy with the Spy Earpiece, ensuring that your communication activities remain confidential and secure. Note:- (BUYER WILL BE RESPONSIBLE FOR ANY ILLEGAL USE OF ANY SPY GADGETS, MISUSING THESE DEVICE IS PUNISHABLE OFFENCE). Useful to communication for security -law enforcement -detectives-news readers.