Replaceable ceramic core; simply rotate the metal tip counterclockwise and remove it to replace the core. Safe and environmentally friendly lithium battery: Safe and stable, powerful output, recyclable high-quality cells, and long battery life. Network cable sequence detection: RJ45 connector Power meter connector: 2.5mm universal FC Battery type: Rechargeable: 800mAh Wavelength response range: 850-1650Hz Operating temperature: -10°C to +60°C Measurement range: -70°C to +50°C/-50°C to +26°C Accuracy: ±0.2dB Resolution: 0.01dB Frequency recognition: 270/330/1kHz/2kHz Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color: Red Material: ABS Package Contents: 1 x Optical Power Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.