This is the VoltWatch2 on-board Receiver Battery Monitor for 4.8V and 6V NiCd and NiMH receiver packs. This mounts on the outside of the airplane, so you can see at a glance the status of the receiver battery mounted inside. These work great for airplanes and helicopters.
INCLUDES: One VoltWatch2 On-Board Receiver Battery MonitorOne 1.5x1" piece of double sided mounting tape
SPECS:Length: 1.65" (42mm)Width: .63" (16mm)Height: .16" (4mm)Weight: 0.15oz (4.3 grams)Current Draw: approx 4-34mA