Wireless Doorbell Integrated Circuits - HK526B /HK526E

 HK526B is a wireless
   receiver chip , HK526E
   is a transmitter chip .
 Dual tone sound effect .
 " Ding - Dong " and  "
   Ding - Ding " for 2 
   sounds available .
 Option 1 time or twice
   for sound output .
 12 address bus , maxi-
   mum option to 4096 set
   encode code for wire-
   less remote control .