Motorbike helmet speaker: Designed for helmets, perfect for motorcycle riders to enjoy music, listen to GPS voice prompt and make phone calls easily during riding. Allow you a safer, more passionate and happier trips. It is also good for skiing, mountain climbing and horse riding. The speaker is IP66 waterproof, you can have a carefree ride even in the wind & rain. | Bone conduction vibrator: Adopt bone conduction vibration technology. The wireless speaker transmits the sounds through the helmet skeleton to your ears by the vibration, giving you a surging and rich bass experience, and make the riding is more passionate. The open timbre of bone conduction can pay attention to the outside voices while listening to music. Keep alert around and improve the safety of outdoor sports. | Hand-free calls by DSP noise cancelled Microphone: The detachable & adjustable Mic (30cm long) features DSP multiple noise suppression, you can enjoy a crystal clarity phone call. Only a touch the multi-function key to answer or end the phone call during riding, easy and safe. Support Siri voice call dialing and last number redial. | Helmet applications and easy installation: Suitable for various helmets such as uncover helmets, half helmets, full helmets and off-road helmets. Find a good place and stick the 3M bracket onto the helmet, then put the speaker into the bracket, press down and turn it anticlockwise, a slight click indicates the speaker has been fixed to the bracket. Please adjust the charge port downward for better protection from raindrops and dust. When the speaker is not in use, it can be removed from the bracket. | Latest wireless connection: With 5.3 version Bluetooth technology, low consumption and more stable data transmission and better audio sound quality. Built-in 400mAh lithium battery and work for around 5 hours with a full charge around 2 hours.