diff --git a/escpos/constants.py b/escpos/constants.py
index 487befa..da13f98 100644
--- a/escpos/constants.py
+++ b/escpos/constants.py
@@ -27,9 +27,9 @@ HW_RESET  = ESC + '\x3f\x0a\x00'  # Reset printer hardware
                                   # (TODO: Where is this specified?)
 
 #{ Cash Drawer (ESC p <pin> <on time: 2*ms> <off time: 2*ms>)
-_CASH_DRAWER = lambda m, t1='', t2='': ESC + 'p' + m + t1 + t2
-CD_KICK_2 = _CASH_DRAWER('\x00')  # Sends a pulse to pin 2 []
-CD_KICK_5 = _CASH_DRAWER('\x01')  # Sends a pulse to pin 5 []
+_CASH_DRAWER = lambda m, t1='', t2='': ESC + 'p' + m + chr(t1) + chr(t2)
+CD_KICK_2 = _CASH_DRAWER('\x00', 50, 50)  # Sends a pulse to pin 2 []
+CD_KICK_5 = _CASH_DRAWER('\x01', 50, 50)  # Sends a pulse to pin 5 []
 
 #{ Paper Cutter
 _CUT_PAPER = lambda m: GS + 'V' + m