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DDR2 memory indeed operates at lower voltages than its predecessor, DDR memory. Specifically, DDR memory typically operates at 2.5 volts, while DDR2 operates at 1.8 volts. This lower voltage not only helps to reduce power consumption but also decreases heat generation, leading to improved efficiency in computer systems.

This characteristic is significant as it enables DDR2 memory to provide better performance while consuming less power, which is particularly important in mobile devices and laptops where battery life is a concern. This is one reason why DDR2 became popular as computers advanced and the need for energy-efficient technologies increased.

Other characteristics related to DDR2, such as its 240-pin configuration and support for dual-channel architecture, are also noteworthy, but they are not the primary distinctive feature in this context. Furthermore, DDR2 does not inherently have higher latency than DDR memory; in fact, it generally offers improved bandwidth and performance. Understanding these attributes of DDR2 helps in distinguishing it from both DDR and subsequent memory types like DDR3.