【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction. 【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary. 【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device’s requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product. 【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer. Clear sound quality: Poly's unique 3 microphones and 3-layer noise prevention function provide the best noise and wind canceling method. Delivering the best sound even among the sounds of cars, streets, and crowds. Note: If the size of the ear tips does not match the size of your ear canal, or if the headset is not seated correctly, you may not receive the correct sound quality or call performance. Change the ear tips to ones that better fit your ears. Uninterrupted connectivity and convenience: Connect to your mobile device or tablet via Bluetooth and enjoy all-day freedom with a connectivity range of up to 10m and up to 7 hours of talk time. Additionally, multipoint technology allows you to connect two devices at once. Hands-free: Sensors are activated when you put on or take off the headset. When you put on the headset, you can automatically answer incoming calls, transfer active calls from your phone, and resume streaming audio. When you remove the headset, you can transfer an active call to your phone, pause audio streaming, or lock the call button to prevent accidental calls. Excellent operability: Separate buttons for mute, call, volume, and power provide excellent operability. Toggle, slide, and tap buttons to get the features you need without looking at your headset. It's also much easier to power off to extend the lifespan of your device. Manufacturer warranty 2 years