Inside Echo power tools beats a world class, two stroke engine. The heart of Echo's legendary performance and dependability Model GT-2000R Model SRM-2100 Model SRM-2410 GT-2400 SRM-2100SB SRM-2110 SRM-2400 SRM-2400SB SRM-260 SRM-260S SRM-310 SRM-310S SRM-400 ECHO Standard and Optional Equipment Specialty Trimmer Attachments