Contacta STS-A31H Window Intercom Amplifier
The Contacta STS-A31H is an all-in-one Hearing Loop and Duplex Amplifier specifically
designed for all kits in the Window Intercom product range, including power supplies. Delivering clear, two-way communication between staff and customers through protective barriers such as security windows, ticket counters, and service desks.
This compact amplifier powers both the speaker and microphone units, ensuring reliable audio clarity even in busy or noisy environments. Built with high-quality components and simple connectivity, it’s ideal for banks, pharmacies, government offices, and any location where safe, effortless communication is essential.
Note: Power Supply sold separately
Standards
- CE, ROHS, and WEEE compliant
- BS EN 60118-4, in correct installations
Find answers to our most frequently asked questions below. Got more questions? Reach out to our friendly customer service team, they will be more than happy to assist you.

