Specification:  Working voltage: 3V - 12V  fo max. power use 12V Working current: max  Less than 40mA max , and min 9mA Resonance mode: (SAW) Modulation mode: ASK Working frequency: Eve 315MHz  Or  433MHz Transmission power: 25mW (315MHz at 12V) Frequency error: +150kHz (max) Velocity :  less than 10Kbps So this module will transmit up to 90m in open area .