Description:Name: Walkie Talkie EarpieceSize: Φ15mm;Sensitivity: 102dB±2dB;Rated impedance: 32 ohms ±15%;Frequency range: 400Hz to 20kHz;Maximum power: 20mW;Rated power: 20mW;Microphone size: Φ9.6mm;Impedance: 2.2K ohms;Sensitivity: 54dB±2dB;Frequency response: 100Hz to 160kHz;Directionality: all-round;Dual PIN standard diameter: earpiece 3.5 mm stereo (top PIN), microphone 2.5 mm stereo (bottom PIN);Two needle spacing: 11mm;Packing list:1 x earphones1 x packaging bagNote:Due to manual measurement, please allow 1-3cm differences, thanks (all measurements are in cm, please note that 1cm=0.39 inches). There may be color difference due to different computers or smartphones, please forgive me!