Thank you for viewing. I used these a few times, but I've been using a different pair of earphones I received as a gift, so I've been storing these at home. ⭐︎Operation confirmed⭐︎ Wiped down and lightly cleaned with alcohol wipes⭐︎ Box has a slight tear 【Product Specifications】 ● Features a φ10mm driver for powerful bass and extended mid-high range ● Auto-pairing function allows immediate use upon removal from the charging case ● *Initial setup is required ● Multi-function buttons on the ear allow for music/call/volume control ● Skeleton cover on the charging box ● Allows you to check the earphones' charging status without opening the cover. ● LED lamp allows you to check the remaining battery level of the charging box at a glance. ● Can be used with a single ear. 【Detailed Information】 〈Bluetooth Specifications〉………………………………………… ● Communication method: Bluetooth Ver5.0＋EDR ● Output: Bluetooth class2 ● Maximum communication distance: Approximately 10m (line of sight) ● Frequency band used: 2.4GHz band ● Supported protocols: A2DP, AVRCP, HFP, HSP ● Supported codecs: SBC ● Maximum continuous playback time: Approximately 4 hours ● Maximum continuous standby time: Approximately 100 hours ● Charging time: Approximately 1.5 hours ● Built-in battery: 50mAh x 2 lithium-ion batteries 〈Charging Box Specifications〉………………………………………… ● Charging time: Approximately 2 hours ● Built-in battery: 400mAh 〈Earphone Specifications〉………………………………………… ● Type: Canal type ● Driver unit: φ10mm driver unit ● Playback frequency band: 20〜20000Hz ● Impedance: 32Ω ● Maximum input: 5mW ● Sound pressure sensitivity: 95dB/mW ● Charging terminal: microUSB terminal (charging box) ● Included charging cable: microUSB terminal ⇔ USB2.0 〈Size〉…………………………………………………… ● Package size: H185 x W95 x D37mm ● Weight including package: 88.0g ● Earphone weight (single): 9.8g ● Charging box weight: 30.1g 〈Color Variations〉……………………………… ● OPK (Opal Pink)