Note:Due to the problem of logistics time, please charge the product firstLong press +: you can adjust the volumeFeatures:new and high-quality;Simple setup and installation;Pair two devices and take a call from either;Advanced noise suppression and echo cancellation;Low power consumption high performance;Built-in speaker and microphone;To answer/end/reject/redial a call by the Bluetooth speakerphone;Automatically re-connection between speakerphone and mobile phone.Specifications:Bluetooth Specification: V4.1 + EDROperating Frequency Band: 2.4GHz 2.48GHz;Wireless range of up to 10 metersBattery type: 3.7V,650mahNormal Charge Time: up to 3 hours (approx)Talk time: about 20 hoursStandby time: up to 1000hoursSize: 13cm/5.12inch x 5cm/1.97cm x 1cm/0.39inch.Package Includes:1 Bluetooth car kit1 x Micro USB charging cable1 x sun visor clip1 x user manual