Features: - The latest Bluetooth V4.2 chip, high-fidelity stereo, clear and stable call - Ultra low power consumption, continuous playing music for 16 hours. - Built-in high sensitivity microphone with a windproof sponge cover - iOS system can display power and activate SIRI Smart Voice Assistant. - No need for manual operation, automatic call answering, to ensure the safety of the rider - Voice prompts for power on, power off, pairing success, low battery, maximum volume, etc. - The transmission rate is fast and stable, and the unblocked transmission distance is more than 20 meters, up to 50 meters Specifications: Channel: Stereo Play time: 16 hours Talk time: 18 hours or more Speaker power: 30 mWx2 Signal to noise ratio: 110dB Standby time: 700 hours or more Charging time: about 2.5 hours Bluetooth: V4.2andEDR or A2DP or AVRCP or HFP Frequency range: 2.4026GHz-2.480GHz Transmission distance: 20 meters or more Speaker parameters: 24 ohms or 30mm Built-in lithium battery: 3.7V or 250mAh Function: previous song, next song, volume and, volume -, play, pause, answer the call (automatic), make a call, activate SIRI, microphone intercom Package Includes: 1 Pair x Helmet earphones 1 x User Manual Notes: 1. Manual measuring, please allow 1 - 3mm error,thank you. 2. 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 picture.