The s35a is a fully programmable 35 key keypad with multiple layers to allow the user to program shortcuts links text or even mouse clicks using mx technology the accuratus programmable keypad has fantastic reliability and is unrivalled and tested to 50 000 000 clicks per key the s35a comes with a 2 year warranty as standard all keys can be programmed with unlimited characters all data can be retained for no less than 100 years without additional battery does not require a tsr p