Swann Mobile Viewer SW-G-MVIEW 2.4GHz 2.5 LCD Color Screen 4 Channel Security Camera LCD Receiver Super mobile &amp; portable palm size receiver* 2.5" color LCD screen for clear image display Built in speaker for audio monitoring* Wireless 2.4GHz reception up to 150ft (50m)* from camera (not included) Includes 2 rechargeable batteries with 5 - 7 hours air time* Switchable between 4 channels Keep an eye on baby, children, the front door, pool &amp; more from almost anywhere!* Use with any Swann sireless camera Recharges battery in its cradle