Brand Fluke Networks Power Source Battery Powered Item Weight 1.102 lbs Item dimensions L x W x H - 0.39 x 0.39 x 0.39 inches Manufacturer-Fluke Networks Detects dial tone and polarity, places and receives calls, has high-impedance DataSafe operation in monitor mode, and has a 2-way speakerphone for hands-free conversation during testing of telephone lines DropSafe reliability passes 20-foot drop test RainSafe protection in severe weather conditions Stores nine 18-digit numbers in repertory dialer (speed dialing) Polarity indication/Tone and Pulse operation