WM - Watertight Beltpack Transmitter
Designed for wet or dusty environments, the WM transmitter features O-ring sealed battery compartments and input jack, a compression sealed antenna port and gasket sealed control panel and back cover.
YouTube Intro
Key Features

• Selectable output power to maximize battery life or operating range
• Machined aluminum, corrosion resistant housing:
• Water resistant seals for use in wet environments
• LCD interface with lockout option
• Programmable compatibility modes for use with a wide variety of different receivers
• Servo Bias input circuitry with selectable voltage
Dual AA batteries provide twice the operating time of earlier watertight transmitter designs. Larger membrane switches and control panel and a highly visible, backlit LCD enhance the user interface.
  Lithium Battery  
Battery Life: WM 50 mW (2AA): 14.5 Hrs
  WM 100 mW (2AA): 14 Hrs
  WM 250 mW (2AA): 7.5 Hrs
Useful Downloads
Quick Start Guide (2.17 MB)