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Overviewdodocool Wireless In-ear Earphones with Secure Ear Hooks enables you to enjoy high-quality stereo audio and handsfree phone calls. Ergonomic design with adjustable secure ear hooks provides stable and comfortable listening experience for sports. Three sizes of interchangeable earbuds provide reliability and comfort while filtering ambient noise. Specifications Material: ABS Wireless chip: CSR8645 Wireless version: V4.1 Profile support: HSP, HFP, A2DP, AVRCP,APT-X Wireless distance: 10m Interface: Micro-USB port Battery type: Built-in rechargeable 501220 lithium polymer battery Battery capacity: 2 * 95mAh Battery voltage: 3.7V Input voltage: DC 5V Working hours: Up to 17 hours Output S.P.L.: 1013dB Automatic shutdown time: Approx. 5 minutes Speaker frequency response: 20Hz-20KHz Normal impedance: 16Ω Normal Power rating: 3mW Maximum input power: 10mW Ambient temperature: -20~70℃ Certifications: FCC-ID, CE-RED, RoHS Earphone size: Approx. 2.76 * 2.17 * 1.18 in / 70 * 55 * 30 mm Item length: Approx. 2.17ft / 0.66m Item weight: Approx. 0.95oz / 27g Package Includes 1 * dodocool Wireless In-ear Earphones with Secure Ear Hooks 1 pair * S Size Earplugs 1 pair * L Size Earplugs 1 * Micro-USB to USB Cable 1 * Big Wire Clip 1 * Small Wire Clip 1 * Instruction Manual (English, French, German, Spanish, Italian, Japanese)