ITEM NAME:2x Micro-USB Development Board Digispark Attiny85 Support for the Arduino I M9P5 2x Micro-USB Development Board Digispark Attiny85 Support for the Arduino I M9P5 Provide battery backup for the continuous timing. Footprints and functionally compatible with the DS3231. Reset output and input buttons Debounced. High-speed (400kHz) I2C serial bus. Color: Blue Material: metal Temperature range: -40 to +85 Celsius Timing accuracy is maintained: +/- 5ppm (+/- 0.432 sec/day) Output frequency: 1Hz and 32.768kHz Supply Voltage: +2.3V to +5.5V Digital Temperature Sensor Accuracy: +/- 3 Celsius Product size: approx. 14*14*12mm/ 0.55*0.55*0.47 inch Single weight: approx. 2g Quantity: 2pcs Package Contents: 2 x Micro-USB Development Board (with Pin) Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Reset output and input buttons Debounced. Provide battery backup for the continuous timing. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.