Ⅰ. Compact and easy-to-use headphones. Without any extraneous features, the BT-12 has everything you need. The headphones support automatic call recording. Thanks to the built-in speakers, you can listen to music or chat even at high speeds. The BT-12 consumes little power, which means that the battery lasts a long time. The large buttons make the BT-12 easy to use, suitable for wearing motorcycle gloves! Ⅱ. Note: The BT-12 is a universal communication system. However, sometimes the helmet does not have pre-installed holes for the communication system speakers, and this can cause problems with wearing comfort. If you do not have a well-known brand helmet, the speakers may not fit properly because they press on your ears. Therefore, if in doubt, it is advisable to check if there are holes in your helmet. The dimensions of the speakers are as follows: diagonal size about 4.2 cm and height 1.4 cm. We recommend trying it before removing the stickers. Ⅲ. Specifications: 12 hours of talk time; 360 hours standby time; Water resistance tested to IP67; Bluetooth 4.2 connection to your phone for unlimited connectivity; Compatible with modular, full-face and jet helmets; Li-ion battery: 3.7 V/500 mA. Ⅳ. What's included: BT-12 intercom; manual; synthesized microphone with wind protection; 1 micro USB charging cable; Two speakers; Micro-USB adapter for charging anywhere.