Note: Please charge the product first due to logistics time. Long press + to adjust 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 with high performance; Built-in speaker and microphone; Answer, end, reject, or 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