http://simenibiz.com/electronics-gadgets/1033-free-shipping-bluetooth-spy-earpiece-wireless-and-invisible-2-way-system.html<br /><br />The main purpose of the bluetooth spy earpiece set is to provide invisible communication over mobile phone. Ideal for passing exams, taking tests, making speech at a meeting or negotiations, playing gambling.<br /><br />Easy for use:<br />1. Put button cell into earpiece, and enter ear.<br />2. Around headset loop to neck, start Bluetooth headset.<br />3. Use any phone with Bluetooth function to pair with the headset.<br />4. Okay now. Call your phone, speak with mic of loop.<br />5. Control volume button of cell phone and Bluetooth headset both.<br /><br />Specification:<br />* Earpiece receiving: electromagnetism system<br />* Earpiece maximmum volume: 110dB<br />* Battery: sony sr416sw/337, working life: 5~8hrs.<br />* Warranty time: 3 months<br />* Loop diameter: ~25cm
