請問X-MINI 2 喇叭規格問題

網路上與官網規格寫:
Dimension (L×W×H): 60mm×60 mm×44mm (closed resonator)
Net Weight: 83g
Speaker: MAGNETISM PREVENTФ40 MM 2W/4Ω
Loudspeaker Output: 2.5W
Rating Power: 2.0W
Frequency Response: 100Hz-20Khz
Signal-to-Noise: ≥80db
Distortion: ≤1.0%
Playback Time: Up to 11 hours
Battery Voltage/Capacity: 400mAh
Battery Charging Voltage: 4.2V±0.05V
Battery Charge Time: 5V - 2.5 hours

但我買到的產品說明書上卻寫:
Dimension (L×W×H): 60mm×60 mm×44mm (closed resonator)
Net Weight: 83g
Speaker: MAGNETISM PREVENTФ40 MM 2W/4Ω
Loudspeaker Output: 1.9W
Rating Power: 1.7W
Frequency Response: 100Hz-20Khz
Signal-to-Noise: ≥80db
Distortion: ≤1.0%
Playback Time: 4-8hours
Battery Voltage/Capacity: 400mAh
Battery Charging Voltage: 4.2V±0.05V
Battery Charge Time: 5V - 2.5 hours
請問這是正常嗎?
需要退貨嗎?
謝謝!