Features: Compared with the built-in type (the battery is located on the earphone), the internal earphone is light and does not squeeze the ear, which is more comfortable. Large-capacity battery: Up to 450mAh, (built-in type is about 250mAh), which makes the standby time and working time of the whole machine longer. Fix the main unit : make the main unit installation tighter, and the high-speed riding is not easy to fall off. (The built-in type usually uses glue or hook&loop) Use high-power audio amplifier: Make the audio volume range larger, and it will not affect music playback and telephone answering in the noise environment of high-speed riding. High quality amp chip, can restore BT audio with high sound quality. Specification:BT version: 4.1+EDR CSR8635Support agreement: A2DP AND AVRCPLithium battery: 450MAHCharging voltage / current: DC5V/190maFrequency: 2.4GHzAmplifier: HT4832SQWorking time: about 10 hoursMobile phone connection distance: 50 metersSize: approx. 8.5 * 5 * 2cm / 3.3 * 2 * 0.8inPackage list:1 * Host1 * Microphone1 * Screwdriver2 * Screws2 * Hook&Loop1 * Clip1 * Charging Cable Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering