If you're passionate about IT and electronics , like being up to date on technology and don't miss even the slightest details, buy Bluetooth Headset with Microphone CoolBox CoolTwin Black at an unbeatable price. Technology: Dual Driver Type: Wireless Bluetooth Headset with Microphone Headphones with Microphone In-ear headphones In-ear Headphones Connectivity: Bluetooth 4.2 Bluetooth Wireless Microphone: Yes Rechargeable lithium battery: Yes Range: 10 m Approx. charging time: 2 hours Compatible: HFP, HSP, A2DP, AVRCP Frequency response: 20Hz ~ 20kHz Approx. autonomy: 4 hours Includes: Power Cord Headphones Colour: Black Material: Plastic Characteristics: Wireless Year: 2018 Type of headphones: In-ear headphones Connections: Jack 3.5 mm Volume control: Digital Recommended age: Adults Weight: 100 g Headphones: Binaural