Business Bluetooth Headset 5.0 High-Quality Single-Ear Built-in Microphone HSP-B4 Wireless Bluetooth Headset HSP-B4 High-Quality Single-Ear Built-in Microphone Bluetooth Earphone Business Comfortable Wear Hands-Free Calling Japan Technical Standards Conformity Mark Certified (Blue) 【Bluetooth 5.0 High-Quality Headset】: The latest evolved Bluetooth headset single-ear features the world's most advanced technology, guaranteeing the best signal quality and excellent sound quality. This product has obtained the Japan Technical Standards Conformity Mark and electrical safety (PSE) certification, so using it does not violate radio law or electrical safety regulations. Technical Standards Conformity Mark Number: 208-180214 【Dual-Ear Compatible Rotatable】: Compatible with both ears, the ear hook is extendable and rotates 180 degrees, adjusting to the size of your ear, and can adapt to 99% of ears. Also, the call microphone can rotate 270 degrees, allowing you to adjust it to your preferred angle. Furthermore, the ear hook with a fit structure that allows for more stable wearing is made of smooth paint and skin-friendly silicone rubber material, providing a soft wearing feel. 【Compatible Models】: Powerful Bluetooth V5.0 technology can display the battery level on the IOS system and can transmit strong audio and fast, stable signals within a range of 20m. Strong compatibility, can connect two devices simultaneously, making it more convenient. Compatible with most Bluetooth-enabled devices such as iPhone, Android, Samsung, Huawei, and PC. The Bluetooth headset with a microphone has a maximum standby time of 240 hours and can provide up to 12 hours of continuous talk time and 12 hours of music playback. It only takes 1.5 hours to fully charge. Immediate purchase OK, no price reduction.