The SEO Title Rewriter

Act as a conversion rate optimization editor. Help me take an existing, underperforming product title and transform it into an SEO-powered conversion machine.

• Current Title: [e.g., "The X-100 | Our Best Selling Device"]
• Primary Keyword: [e.g., "smart home thermostat"]

Task: Analyze the current title. Then, provide 3 rewritten versions that are more descriptive, include the primary keyword, and clearly communicate a key benefit to the user.