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Product Description: -The headphone delivers balanced and super clear mid-high frequency as well as impressive booming bass -Stable CSR Chips and bluetooth 4.1 technology allows perfect compatibility -Designed with advanced technology to ensure the fastest, optimum charging experience. Specifications: Bluetooth version: V4.1(Single right ear) Frequency range: 2.4GHz- 2.48GHz Working range: up to 10m Support protocols: A2DP,AVRCP,HSP,HEP Talking time: about 4hours Music time: about 4hours Standby time: 100hours Charging time: about 0.5-1hours Input voltage: 5V/100mA Working environment: -20°TO 60° Package Includes: 1 *Bluetooth earphone 1 *USB cable 1 *Operating Manual