A reflective display device includes a housing, a reflective display unit, an auxiliary display unit, a power supply, a wireless transceiver, a lighting unit, a light sensing unit, a light source control module, an identifying module, and a display control module. The power supply supplies power to the reflective display device and converts ambient light into electrical power and stores the electrical power. The wireless transceiver receives information transmitted from the electronic device. The lighting unit is fixed to the housing and illuminates the reflective display unit. The light sensing unit detects brightness of ambient light. The light source control module turns on/off the lighting unit. The identifying module identifies the type of the information. The display control module selectively controls the information to be displayed on the reflective display or the auxiliary display unit according to the type of the information.