This chip has a precision 25MHz crystal reference and internal PLL and dividers. It can generate any frequency, from <8KHz up to 150+ MHz. The Si5351 is an configurable clock generator that is ideally suited for replacing crystals, crystal oscillators, VCXOs, phase-locked loops (PLLs), and fanout buffers in cost-sensitive applications. It uses the onboard precision clock to drive multiple PLL's and clock dividers using instructions. Outputs are 3Vpp, either through a breadboard-friendly header or, for work, an optional SMA connector. Color: Material:Metal+Plastic Package Contents: 10 * signal generators 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.