QTB35 Features: 1. Build-in fm radio in b35 providing radio show in your riding journy. 2. 4.1 EDR+ CSR chipset/ Audio Amplifierereo music playing/A2DP and AVRCP BT protocol. 3. Handsfree to Call /listen to music/FM radio. 4. 450mah rechargableLi-ion battery. 5. Waterproof: IP54 waterproof.Descriptions: 1.In order to make riding safer and easier,B35 BT helmet headset is designed for remote operations for mobile phone calling stereo music playing and FM radio.The advanced CSR BT chipset and the intrgrated headphone amplifier inside B35 provide a better experience of phone calling and stereo music.Its delicate,small and water-proof design makes B35 be a good companion on your riding journey. 2.Compatible with all BT enabled devices for stable connection and superior HD stereo sound.Specifications: Model: QTB35 Size: 16037180mm Color: black&blue BT chipset version:4.1+EDR CSR8635 BT profile:A2DP and ACRCP Battery capacity:450mAh Charging voltage/current:DV 5V/190mA Frequency:2.4GHz Amplifier:HT4832SQ Working duration:~10 hours Mobile phone distance:50 meterPackage included: 2 x QTB35 Bluetooth Headset 1 x Mic And Trumpets2 x Velcro Inside Helmet 1 x Fixed Folder1 x Screw Driver 2 x Screws 1 x Charging Cable 1 x User ManualMH04 Feature: 1. Wirelessly listen to music with integrated bluetooth technology. 2. Fashion design, let music surrounding your life any time. 3. Hands free function, truly free your hand. 4. Set-in rechargeable Li-ion batery, long stand-by and working time. 5. 5.0 type BT chip, Hi-Fi earphone. 6. DIY design, available to be detachable when you want. 7. Sound reminder function, easy to set the device according to sound remind.Specifications: BT version: 5.0+EDR Frequency: 2.402GHz-2.480GHz Effective range: 20-30m(Depends on environment) Microphone transmission distance: 1m Battery capacity: 3.7V/180mA Music time: 8 hrs Charging voltage: 5V Charging time: 1.5 hrs Standby time: 160 hrsPackage Included: 1 x Headphone 1 x USB cable 2 x Horns 1 x ManualNotes: The phone call will be answered automatically around 5 seconds if you don't do any operation.Notes:1.Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2.Due to the manual measurement and different measurement methods, please allow 1-3mm deviation. Thanks!