This item is in very clean condition with no signs of use. Operation has been confirmed. [Key Features] ■ Equipped with Bluetooth function ■ Wireless listening to music from iPhones, smartphones, etc. ■ Operate iPhones, smartphones, etc. at your fingertips ■ One-touch connection (NFC) function ■ Supports multi-pairing and multi-point ■ Receiver type that can be connected to various headphones ■ Achieves rich high-quality sound despite its compact size ■ Keep cords tidy. Enjoy music smartly ■ Comfortable fit [Specifications] ● Communication method: Bluetooth standard Version 3.0 ● Output: Bluetooth power class 2 ● Maximum communication distance: Approximately 10m (straight line) ● Frequency band used: 2.4GHz band (2.4000GHz-2.4835GHz) ● Modulation method: FHSS ● Supported Bluetooth profiles *1: A2DP, AVRCP, HFP, HSP ● Supported codecs *2: SBC, AAC ● Supported content protection: SCMS-T ● Transmission band (A2DP): 20Hz - 20,000Hz *3 [Headset (Receiver)] ● Type: Sealed dynamic type ● Driver unit: 9mm, dome type ● Playback frequency band: 5-24,000Hz ● Cord: 0.6m Y-type ● Plug: Gold-plated L-shaped stereo mini plug ● Power supply: Built-in lithium-ion rechargeable battery ● Battery life (continuous talk time): Approximately 8 hours ● Battery life (standby time): Approximately 120 hours ● Weight: Approximately 3g (headphone part) / Approximately 20g (receiver part, including rechargeable battery) ● Battery life (continuous audio playback time): Approximately 8 hours ● Charging time: Approximately 2.5 hours [Headset (Microphone)] ● Type: Electret condenser type ● Directivity: Omnidirectional ● Effective frequency band: 100Hz - 4,000Hz