Main Specifications: BT Chipset: 5.0 Frequency: 2.402GHz~2.480GHz Range: 20~30 meters Li-ion battery: 3.7V 250mA Charging voltage: 5V Charging time: <1.5 hours Standby time: about 160 hours packing list: Headphone*1 charging cable*1 manual*1 About the question: 1. Pair with the phone? Press and hold the dial button for 3 seconds, the LED indicator will flash red and blue alternately, and enter the Bluetooth pairing state. Turn on the phone's Bluetooth, enter the Bluetooth list, select the Bluetooth name (BT Audio), and then click Connect. 2. Will it automatically re-pair? If the phone is already paired with the headset, turning the headset on again will automatically re-pair. 3. How to pair A/B two phones with BT5? Disconnect phone A's Bluetooth connection. Refer to steps 1-2 to re-pair the headset with the B phone. Then turn on the phone A and connect the Bluetooth headset. Currently, both A and B are connected to BT audio. 4. Turn on/off/voice assistant? Press and hold the dial button for 3 seconds to turn on, the headset prompts to turn on Press and hold the dial button for 3 seconds to shut down, the headset prompts to shut down Long press the dial button for 2 seconds, the phone voice assistant wakes up. Priorities: Phone > Music. When there is an incoming call, the music will be paused, and the music will automatically resume playing after the call. IMPORTANT: If you have installation and usage issues after purchase, please check the video we uploaded, if not resolved, please feel free to email us ?The Perfect Gifts for Men, Dads We provide motorcycle helmet bluetooth headset, package block thoughtful after-sales service, please note that M5H does not support intercom function as well as radio function, if you have other questions, please contact us by email for video instructions or any questions. Upgrade bluetooth chip BT 5.0 chip, high fidelity headset, removable at any time, hands-free calling, easy to wake up mobile assistant. This helmet headset speaker is 9mm (0.35 inches) thick, about the same thickness as the Iphone 6s/Iphone X. It won't squeeze your ears. ?Playtime that lasts all day This motorcycle helmet microphone built-in 250mah high-capacity lithium-ion battery, a single charge requires only 1.5h can be full, can standby 160 hours. Perfect for short distance riding and weekend outdoor riding activities. Suitable for outdoor sports The 10~20m Bluetooth connection distance is ideal for motorcycle riding, bicycle riding and other outdoor sports, the built-in Bluetooth 5.0 chip is compatible with all Bluetooth-enabled mobile devices and automatically connects to paired cell phones within range. ?Ultra thin headphones Both ear pads of the M5H BT5.0 Headphones are only 0.35 inches thick, so there's absolutely no ear crowding when wearing a helmet. BT5 supports automatic answering of incoming calls. The built-in chip will automatically give priority to answering incoming calls, and continue to play music after incoming calls.