I am selling the ELECOM LBT-HS10MPBK Bluetooth headset, designed for calls. I purchased it approximately 5 years ago. I never used it, as I didn't open the package, and I haven't had an opportunity to use it since, so I'm listing it for sale now. * Pets: None * Smoking: Non-smoker Below is information extracted from the product website: ＜Specifications＞ Communication method: Bluetooth standard version 3.0 Output: Bluetooth power class 2 Maximum communication distance: Approximately 10m (line of sight) Operating frequency band: 2.4GHz band Modulation method: FHSS (Frequency Hopping Spread Spectrum) Supported Bluetooth profiles: HFP, HSP Maximum number of registered devices: 8 Multipoint (simultaneous standby): Not supported Maximum continuous talk time: Approximately 5 hours Maximum continuous standby time: Approximately 100 hours Power supply: 5V (USB charging) 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: microUSB (for charging) Operating environment conditions (temperature): 5℃ to 35℃ Operating environment conditions (relative humidity): 20% to 80% (without condensation) Storage environment conditions (temperature): 0℃ to 40℃ Storage environment conditions (relative humidity): 20% to 80% (without condensation) External dimensions: 14.0 x 9.0 x 53.1mm (excluding protrusions) Weight: Approximately 8g Color: Black Accessories: USB charging cable, ear tips (S, M, L: M is already attached to the main unit), ear hooks (1 each for right and left ears), instruction manual (with warranty), quick connection guide