Sennheiser SK 100 G4 Wireless Bodypack Transmitter (A: 516 to 558 MHz)

The Sennheiser 509501 is a wireless bodypack transmitter built for performers and presenters who want audio that stays clear and dropout free without the limitations of a cable. As part of the Evolution Wireless G4 line, it works in the A band between 516 and 558 MHz and pairs instantly with the Sennheiser EM 100 G4 receiver.

With a line-of-sight range of up to 330 ft, the unit lets stage vocalists, guitar players, and corporate speakers move freely while the signal stays stable. A 42 MHz tuning window that holds 1680 selectable frequencies helps you find open channels in crowded RF environments.

The locking 3.5 mm input accepts microphones such as lavaliers and headsets, or an instrument cable when you add the proper adapter. An adjustable input level and a 30 mW RF output make it easy to match anything from a soft-spoken presenter to an electric guitar.

Setup takes seconds. Hold the bodypack next to the receiver, press the infrared sync button, and the two units share frequency information automatically. A backlit LCD shows battery life, channel, and mute state so you can check settings at a glance, even in low light.

Power comes from two standard AA batteries for up to eight hours of continuous use, or from the optional BA 2015 Accupack when you prefer a rechargeable solution. The body uses metal construction that stands up to consistent on-the-road handling, and it stays compatible with earlier Evolution Wireless systems so you can expand or replace gear without reworking an entire rig.

Whether you are leading worship, shooting a documentary, delivering a keynote, or playing a club gig, the SK 100 G4 transmitter delivers the reliable wireless performance that professionals expect from Sennheiser.

• Operates in the 516-558 MHz A band with EM 100 G4 receivers
• 330 ft line-of-sight transmission range
• 42 MHz bandwidth with 1680 selectable frequencies
• Locking 3.5 mm input accepts lavalier or headset microphones and instrument cables
• Infrared synchronization for quick and secure pairing
• Adjustable input level with 30 mW RF output
• Runs up to 8 hours on two AA batteries or on the optional BA 2015 Accupack
• Metal housing built for daily stage and rental use
• Backward compatible with earlier Evolution Wireless systems