SLT 28XX : A Legend of Durability (เหล้าเก่าในขวดใหม่)

The 28XX Series is another evolution of the 26XX, sharing a similar modern exterior with the 27XX. However, the real shift is under the hood: the circuitry was redesigned to align with modern electronic components, but it consciously omits the microcontroller to keep costs more affordable than the 27XX.
SLT 27XX : A Legend of Durability (ผู้อาภัพ)

The 27XX Series is the direct successor to the 26XX, featuring a refined and more aesthetic exterior. However, the real transformation is inside: a complete overhaul of the internal circuitry, now powered by microcontrollers for smarter and more precise operations.
SLT 2606 : A Legend of Durability (ซ่อมยากฉิบ….)

The 2606 is the ultimate powerhouse in the 26XX lineup. More than just a telephone, it features dual-line inputs, acting as two separate units in one body. Perfect for multitasking, it even allows for seamless conferencing across both telephone lines at once.
SLT 2604 : A Legend of Durability

A solid mid-tier entry in the 26XX lineup: The 2604 covers all the fundamentals. It’s the go-to model for those who need a complete set of essential features for their home or office setup.
SLT 2601 : A Legend of Durability

Introducing the 2601: the most basic entry-level version of the 26XX Series. While this family boasts nearly ten sub-models, the 2601 remains the simplest and most fundamental of them all.