☆Price reduction negotiations welcome☆ The box has been taken out of the bag, but the item is unused after purchase. Please state your desired price in the comments for a discount. The instruction manual is missing. However, you can check the instruction manual on the website. Features ●Bluetooth 3.0 ●900m* Bluetooth intercom communication ●Multi-call function with multiple users ●Bluetooth stereo headset profile for playing MP3 music players with Bluetooth function ●Operation of Bluetooth music player via AVRCP profile (play, stop, fast forward, rewind) ●Easy operation with multi-function jog dial ●Sufficient volume and excellent sound quality with audio booster function ●Can be used while charging ●Volume control for each connected device even when connected simultaneously ●Additional function upgrades possible via firmware *Varies depending on the environment. As a headset ・Hands-free calls with Bluetooth-equipped mobile phones ・Listen to voice guidance from Bluetooth GPS navigation through the headset When worn ・Secure design that prevents the device from slipping during outdoor activities ・Robust design, and splash-proof design to protect from sweat or rain during outdoor activities ・10 hours of continuous talk time and 7 days of standby time on a single charge 【Specifications】 General Specifications ●Talk time: 10 hours ●Continuous standby time: 7 days ●Intercom communication distance: 900m* (varies depending on the environment) ●Operating temperature: -10℃ to 55℃ ●Dimensions: 145mm x 115mm x 73mm ●Weight: 112g Bluetooth ●Bluetooth Profiles: ・Headset Profile ・Hand-Free Profile (HFP) ・Advanced Audio Distribution Profile (A2DP) ・Audio Video Remote Control Profile (AVRCP) ●Bluetooth v3.0 Audio ●Built-in SBC codec ・Noise cancellation function ・Wind noise reduction function ・Wide volume adjustment ・Sample rate: 48kHz (DAC) ・External input terminal 3.5mm Battery ●Battery charging time: 2.5 hours ●Battery type: Lithium polymer battery