Feature: *Power supply:DC 5v or 3.3V; *RF power:&le10mw *Receiving current:<25mA *Transmitting current:<40mA *Sleep current:<20uA *Transmission distance can reach 500m *Size:47mm*26mm*10mm (without antenna port ). Extend: 1) Update your product's capabilities or create new ones with our simple to use modules; 2)We can provide you in a variety of design and manufactured products at very reasonable prices; 3)Your design and logo are welcome; 4)Excellent technical support available to help you integrate our modules in your product; 5)Offer one-year warranty, 30-Day Satisfaction Guarantee. Contact person:Jancy skype:jancy20061