Note: Due to 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; Answer/end/reject/redial a call using the Bluetooth speakerphone; Automatically reconnects between speakerphone and mobile phone. Specifications: Bluetooth Specification: V4.1 + EDR Operating Frequency Band: 2.4GHz 2.48GHz Wireless range 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 1000 hours Dimensions: 13cm x 5cm x 1cm (5.12in x 1.97in x 0.39in) Package Includes: 1 x Bluetooth car kit 1 x Micro USB charging cable 1 x sun visor clip 1 x user manual