edbd6c27_gy_Co___Limited_on_Alibaba_com__Buzzer
[Status type] Key In Wrong Programming Instruction [Red LED] on [Green LED] on [Yellow LED] flash [Buzzer] 
3 short beeps
a s h o r t b e e p
a l o n g b e e p
c o n t i n u o u s b e e p s
2 s h o r t b e e p s
3 s h o r t b e e p s
RF card single door access control system PY-MG236B, View access control, PROYU Product Details from Shenzhen Proyu Technology Co., Limited on Alibaba.com
Buzzer