there are 2 of The SMS 16MB Kit includes two 8MB SIMM modules with a total capacity of 16MB. The memory features ECC functionality, making it suitable for error correction. With a bus speed of PC-133, this SDR SDRAM kit is designed for high performance in computers and networking devices. The manufacturer warranty covers one month, ensuring reliability and support for the product. The compact form factor and 72-pin design make it compatible with a variety of systems, making it a versatile and reliable memory solution for your computing needs.