Note: Due to the problem of logistics time, please charge the product first Long press +: you can adjust the volume Features: 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 + EDR Operating Frequency Band: 2.4GHz 2.48GHz; Wireless range of up to 10 meters Battery type: 3.7V,650mah Normal Charge Time: up to 3 hours (approx) Talk time: about 20 hours Standby time: up to 1000hours Size: 13cm/5.12inch x 5cm/1.97cm x 1cm/0.39inch. Package Includes: 1 Bluetooth car kit 1 x Micro USB charging cable 1 x sun visor clip 1 x user manual