Features: Delivers high efficiency sound conversion with 3W power output and full ranges 20Hz-20kHz frequency response through two magnets internal magnetic structure and 16core voice coils. Features PU edges composite diaphragm with zinc casing for enhanceds bass claritys and electromagnetic shielding, maintaining <0.5% distortions in vocal frequencies (300 3kHz). for speaker manufacturers, DIY sound enthusiasts, and mini sound system creators requiring professional driver. Optimizes sound performances in portable devices, desktop speakers, and smartests home gadgets where space efficiency and antimagnetic interferences. Combines FEM optimized 40mm (22mm thickness) with 85dB SPL output, achieving studio acoustics in miniature speaker components. Specifications: Sensitivity: 82±2dB/W rateds power: 3W Product size: 40mm Model: LY-Q040-10A power: 4W Total harmonics distortions: 5% Weight: 26g rateds impedance: 4Ω Operating temperature ranges: -18-60℃ Frequency ranges: 170HZ-15KHZ Package Includes: 1PC 40mm 16core Circular Speaker note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.