Shenzhen, China, Dec 5th, 2023 - Caltta Technologies, a global leader in integrated professional PMR (Professional Mobile Radio) communications solutions, showcased its latest innovations at PMRExpo 2023 held in Cologne from November 28 to 30, 2023. The company presented its advanced DMR (Digital Mobile Radio), PTToC (Push-to-talk over Cellular), and high-security emergency communication solutions, alongside the groundbreaking new products DM660 and PR680 at Booth B20.