Bluetooth Earpiece Neckloop 3Watt Amplifier Loopset Spy Hidden Invisible Nano Mini Earphone Magnet Stick This Powerful Bluetooth Neckloop Ear Plug Kit offers enhanced covert communication solutions at a very affordable price. It is a great choice to build low cost wireless covert transmissions for business meetings, security protection, covert operations, exams and much more. This kit Includes all you need in one pack. Paired easily with Bluetooth supported mobile phones. Operation is very easy and fast. It features a built-in 3 Watt audio amplifier. Compact neckloop design and micro earpiece size. Great for long time operation. Features: Built-in Amplifier - 3 Watt (for powerful sound). Bluetooth communication. 320mAh built-in battery. Integrated microphone. Mute function. SOS Function. Volume control. Range to earphone - up to 80cm. Range to phone - up to 10m. Specifications: Frequency Range: Bluetooth 2400~2480MHz / Earphone 200Hz ~ 5400Hz. Bluetooth Talking Time ~2.5 hours / Earphone ~6 hours. Use Instructions: 1. Insert the earpiece into ear canal. 2. Pair the Bluetooth neckloop with a mobile phone (just like every Bluetooth headset) 3. Wear neckloop on neck and play music or make a phone calls using the mobile phone. Mute and SOS functions are available during phone calls. Please specify a requested color in the order notes, otherwise a default color will be shipped.