012604 3-in-1 DS1307 + AT24C128 + DS18B20 Board Module - Deep Blue
DS1307 real-time clock chip supports IIC protocol; On-board AT24C128 EEPROM chip; With DS18B20 digital temperature sensor chip supports signal-port protocol; 32.768KHZ crystal provide accurate clock signal for module; CR1220 SMD battery holder; Supports DC 5V input; Pin: 2.54mm.