Description Uses a DS1302 serial real-time clock (RTC) chip Adopt the universal 32.768kHz crystal oscillator Button cell holder for LIR2032 rechargeable Li-ion battery 5-Pin anti-reverse cable included The Real Time Clock RTC-DS1302 Module adopts the universal 32.768kHz crystal oscillator. Includes a 5-Pin anti-reverse cable. Application Hand-held devices Electronic watch Electronic alarm View more What's Included 1x RTC-DS1302 module 1x 5-Pin anti-reverse cable Specifications Operating Temperature: 0 °C ~ +70 °C