Item Name: 50M Waterproof Helmet Headset Hands Free bluetooth V4.2 Intercom for Motorcycle. Product DescriptionSpecification:Name: bluetooth HeadsetModel: T2bluetooth Specification: V4.2+EDR/A2DP/AVRCP/HFPFrequency: 2.4026GHz-2.480GHzTransmission Distance: 20-50m / 66-164ftChannel: StereoSpeaker Parameters: 24 ohms / 30mmSpeaker Power: 30 mW*2Signal to Noise Ratio: 110dBSiri: SupportLithium Battery: 3.7V/250mAhUsing Time: 13 hours (100 volume)Talk Time: 18 hours or moreStandby Time: 700 hours or moreCharging Time: About 2.5 hourRest Time: 1200 daysInstallation:1. Remove the inner lining of the ear part of the helmet, tear off the release paper of the tape surface, and stick the tape on the ear part of the helmet, stick one on each side, and press it firmly to make it firmly.2. Tear off the release paper of the crocheted tape, put the tape on the back of the earphone, stick one on each side, and press it firmly to make it firmly.3. Attach the earphone with the microphone tube and the button to the tape of the left ear of the helmet, and press it to make it firmly. Install the inner lining of the left ear back into the helmet, and position the microphone and USB charging head to ensure that the microphone is facing the mouth (if the adjustment is not in place, it may affect the call).4. Pass the sub-headphone through the top of the helmet and buckle it on the rough surface of the helmet's right ear. Press it firmly to make it firmly. Then install the inner lining at the right ear.5. The headset can be disassembled, the tape fix is better, pay attention not to use too much force when disassembling, so as not to pull the tape off.Tips:Headphones need to be close to the ear to achieve the best sound.Different brands of helmets on the market have different lining depths at the ears. Buyers need to adjust the height of the headphones in the helmet so that the headphones are as close as possible to the ear for the best experience.Features:Latest bluetooth V4.2 chip, high fidelity stereoNo need for manual operation, automatic call answeringBuilt-in high sensitivity microphone with windproof sponge coverbluetooth headsets have a static placement time of up to 1200 daysiOS system displays battery power and activates SIRI Smart Voice Assistantbluetooth transmission rate is fast and stable, 20-50 meters transmission distancelow power consumption, continuous playing music for 13 hours (100 volume)English voice prompts for power on, power off, pairing success, low battery, maximum volume, etcCan be used in most motorcycle helmets on the market, can be installed in DIY, simple and convenientNotes:1. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding.2. Please allow a little difference due to manual measurement.Package Included:1 x bluetooth Headset1 x User Manual1 x USB Cable3 x Microphone Sponge Cover4 x Adhesive Tape