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Technical Parameters: Bluetooth version: V4.1 version Bluetooth chip: CSR8635 Speaker type: Neodymium Magnet Speaker /:Φ13mm Rated Output Power:3mW Sensitivity:110+ 3dB At(0dBm@1kHz) Frequency response:20Hz~ 20kHz Receiving distance: 10 meter/33 feet Battery: 3.7V / 80mAh Working voltage: 3.7V ( 3.3-4.2V ) Charging time: ≤ 2H Playtime: ≥ 6H ( varies by volume level and content ) Standby time: ≥180 H Frequency shift: GFSK, TT / 4 DQPSK, 8DPSK Signal to noise ratio: > 75 db Distortion: < 0.5% Input: DC5 ± 0.25V