I am selling the ELECOM Bluetooth headset LBT-HPS03BK. I purchased it about 5 years ago. I opened it to check the contents, but I never used it. Since I haven't had a chance to use it since then, I am selling it now. ※ Pets: None ※ Smoking: Non-smoker Below is information extracted from the product website: ＜Specifications＞ Communication method: Bluetooth standard version 4.1 Output: Bluetooth power class 2 Maximum communication distance: Approximately 10m in clear line of sight Operating frequency band: 2.4GHz band Modulation method: FHSS (Frequency Hopping Spread Spectrum) Supported Bluetooth profiles: A2DP, AVRCP, HFP, HSP A2DP supported codecs: SBC A2DP supported content protection: SCMS-T Transmission band (A2DP): 20-20,000Hz (at 44.1kHz sampling) Maximum number of registered devices: 8 Multipoint (simultaneous standby): Supported Maximum continuous playback time: Approximately 6 hours Maximum continuous talk time: Approximately 7 hours Maximum continuous standby time: Approximately 120 hours Power supply: 5V (USB power supply) Built-in battery: Lithium polymer rechargeable battery Charging time: Approximately 2 hours Microphone type: Electret condenser type Microphone directivity: Omnidirectional Microphone sensitivity: -42dB (1V/pa, at 1kHz) Microphone effective frequency band: 100Hz-3,000Hz Input terminal: USB micro-B x 1 (for charging / also serves as the right earphone connection terminal) Operating environment conditions (temperature): 5℃ to 35℃ Operating environment conditions (relative humidity): 20% to 80% (without condensation) Storage environment conditions (temperature): -10℃ to 50℃ Storage environment conditions (relative humidity): 20% to 80% (without condensation) External dimensions: 17.8 x 12.8 x 51.6mm (excluding protrusions) * Cable length: Approximately 45cm Weight: Approximately 10g Color: Black Accessories: USB charging cable, ear tips (S, M, L each 1: M is already attached to the main unit), right earphone, ear hook, instruction manual (with warranty), quick connection guide