It will help you collect various physical signals under the natural environment; Compatible with wireless sensors of Arduino; Powered by Li-polymer battery and solar panel, low power consumption, long lifetime; With Bee interface; Crystal frequency: 8MHz; Working voltage: 3.7~5V; Power: 2.0mm JST / USB; ADC input: private channel (ADC0~ADC3, 10bit resolution); Communication mode: UART / SPI; Electronic block interface: I2C, D7, D8; RTC accuracy: +/-2ppm (0~40'C) / +/-3.5 (-40~85'C); DS3231 temperature sensor accuracy: +/-3'C; Battery JST input voltage: 3.5~4.2V; Solar panel JST input voltage: 4.6~6V; UART working frequency (when write code): 115200bps; Arduino IDE board: Arduino Pro or Pro Mini�3.3V，8MHz）w/ Atmega 328; Outdoor signal collection / RTC / temperature sensor.