diff --git a/main.c b/main.c
index c9f9541..2f1b81c 100644
--- a/main.c
+++ b/main.c
@@ -509,8 +509,13 @@ void main(void)
 	led_max7219_off(0xff); // switch displays off
 	printf("OK\n");
 
-	// display numbers on TM1637
+	// get and display numbers on TM1637
 	for (uint8_t number=0; number<LENGTH(numbers); number++) {
+		uint8_t ram[2] = {0};
+		if (!rtc_ds1307_read_ram(ram, number*sizeof(ram), sizeof(ram))) {
+			printf("could not get number from DS1307\n");
+		}
+		numbers[number].number = (ram[0]<<8)+ram[1];
 		mux_select(number);
 		if (0xffff==numbers[number].number) {
 			led_tm1637_off();
@@ -673,7 +678,7 @@ void main(void)
 			uint16_t buttons_diff = buttons^buttons_new; // get difference
 			buttons = buttons_new; // save new state
 			if (buttons_diff) { // only do something if there is a change
-				//printf("button pressed: %016b\n", buttons);
+				printf("button pressed: %016b\n", buttons);
 				for (uint8_t number=0; number<LENGTH(numbers); number++) {
 					if (buttons_diff&(1<<numbers[number].up) || buttons_diff&(1<<numbers[number].down)) { // buttons for number
 						if (buttons&(1<<numbers[number].up) && buttons&(1<<numbers[number].down)) { // both buttons are pressed
@@ -701,6 +706,11 @@ void main(void)
 					} else {
 						led_tm1637_number(numbers[number].number);
 					}
+					// save number
+					uint8_t ram[2] = {numbers[number].number>>8, numbers[number].number};
+					if (!rtc_ds1307_write_ram(ram, number*sizeof(ram), sizeof(ram))) {
+						printf("could not set number on DS1307\n");
+					}
 				}
 				if ((buttons_diff&(1<<9) && buttons&(1<<9)) || (buttons_diff&(1<<8)  && buttons&(1<<8))) { // buttons for time pressed
 					rtc_ds1307_time = rtc_ds1307_read_time(); // get time/date from external RTC