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Effective Distance: 10 meters, snr: >80dBDistortion degree: 1%, charging input voltage: DC5 ± 0.25V, battery specification: 3.7V 500mhA, charging time: 2.5H, impedance: 4 Ω, speaker Power 3WContinuous Call: ≥ 14H, can play music continuously: ≥ 5H.CTN G.W.:9.2KG; CTN SIZE: 45*34*27cm