YS-134-S/134B-S is a narrow type adjustable European electric strike, which is designed for narrow wooden door, narrow metal doors and so on. Use metal structure, lock tongue use zinc alloy die-casting, panel use 304 stainless steel, durable, can withstand 300kg static strength. Security type: Fail Secure. Special design: Adjust the mechanical switch on the lock body to make the electric strike keep unlocked (it remains unlocked no matter the power is on or off). Have door signal output (NO, NC, COM).