This model CTS-205 is actually a professional Wireless Spy Secret Service Earpiece for law enforcement, casino security and protection personnel. The tiny earbud fits into your ear and can receive audio instruction from your partner up to 3000' away. Just place the wallet receiver into your pocket to receive a 1-way wireless transmission from your partner on their walkie-talkie. This complete kit comes with the earbud, a covert wallet receiver for use by the earbud wearer, and Normally this kind of covert equipment is released only to CIA or the Secret Service, but now it can be yours. *Over 3000' Wireless Range Earbud Runs *15 Hours On 1 Battery *16 Channel Walkie-Talkie *Max Volume 93 @ 3kHz *Far/Near Transmission Section Micro-Ear Wireless Earpiece Specifications Dimension 3 x 5 x 7mm Max Volume Output 3 kHz 93 General Volume Output 1kHz 73 Frequency 300Hz - 5kHz Distortion Rate < 2% S/N Ratio at 2kHz > 50dB Receiver Electromagnetic Zinc Battery Style #416 (available anywhere) Battery Life 15 hrs. Weight (incl. battery) only 0.8g!