Plantronics CS520 Wireless Headset
The Plantronics CS520 is our binaural over-the-head wireless headset designed for professionals who spend long hours on calls and need to stay focused in busy office environments. Both earcups deliver rich, clear audio while passive noise canceling helps you concentrate on every conversation.
We built the CS520 on DECT 6.0 wireless technology, giving you up to 350 feet of roam range and eliminating interference from Wi-Fi networks. The base station pairs quickly with your desk phone, and the lightweight headset recharges between shifts so you're always ready for the next call.
Whether you're in customer service, inside sales, or managing a busy help desk, the CS520 gives you the freedom to move around your workspace while keeping both hands free. Our engineers designed it for all-day wear with plush ear cushions and an adjustable headband that distributes weight evenly.
Core specifications for the CS520
DECT 6.0 wireless range and interference-free calling
We chose DECT 6.0 technology for the Plantronics CS520 specifically to eliminate the frustration of dropped calls and audio dropouts. Unlike older 2.4 GHz headsets that compete for bandwidth with Wi-Fi routers and Bluetooth devices, DECT operates on a dedicated frequency band reserved for voice communication.
You’ll stay connected up to 350 feet away from the base station in a typical office environment, giving you the freedom to walk to a filing cabinet, visit a colleague’s desk, or step into a break room without ending your call. The HL10 handset lifter included with the CS520 automatically picks up your desk phone line when you press the headset’s call button, so you never have to return to your desk to answer.
Binaural design for focus in noisy environments
We designed the CS520 with earcups that cover both ears because our research shows binaural headsets help professionals concentrate better in open-office and call-center settings. The over-the-ear cushions create a passive sound barrier that reduces background chatter, keyboard noise, and other distractions.
Both speakers deliver balanced audio so you catch every detail of the conversation, from soft-spoken customers to fast-talking prospects. Wideband audio support means when your phone system is equipped for HD voice, you’ll hear the difference immediately—clearer consonants, less listener fatigue, and fewer requests to repeat information.
Battery life and charging convenience
The CS520 gives you up to 9 hours of talk time on a single charge, enough to cover a full business day for most professionals. Between calls, the headset enters standby mode and can hold a charge for up to 50 hours, so you won’t lose power over a long weekend.
We built the charging cradle into the base station so there’s no separate dock to manage. Just place the headset in the base at the end of your shift, and it’s fully charged when you return. A visual indicator on the base station shows charging status at a glance.
Other wireless headsets in the CS Series lineup
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Common questions about the CS520
The CS520 is designed to work with traditional analog desk phones and most VoIP desk phones that have a standard handset port. You'll connect the base station to your phone using the included telephone interface cable and HL10 handset lifter.
For VoIP systems, check that your desk phone has physical handset and headset ports—most models from Cisco, Polycom, Yealink, and similar manufacturers do. If you're using a softphone application on your computer rather than a physical desk phone, you'll want to look at our Savi or Blackwire series instead, which are optimized for PC connectivity.
The CS520 provides up to 350 feet of wireless range in a typical office environment with standard drywall construction. Actual range depends on your specific building layout—metal studs, concrete walls, and elevator shafts can reduce distance.
Most users find they can move freely throughout a 5,000 to 8,000 square foot floor plan without losing connection. The DECT 6.0 technology maintains audio quality even at the edge of range, so you won't experience gradual degradation the way older wireless headsets do.
The CS520 is a single-connectivity headset designed to pair with one desk phone at a time. It does not support simultaneous connections to multiple devices.
If you need to switch between a desk phone and computer throughout your day, our Savi W720 offers multi-connectivity with the same binaural comfort. For users who only need desk phone functionality, the CS520 provides a simpler, more reliable solution.
The CS520 is a binaural headset with speakers in both earcups, while the CS510 is a monaural headset with a speaker in just one ear. Both models use the same DECT 6.0 base station and offer identical wireless range and talk time.
We recommend the binaural CS520 for call-intensive roles in noisy environments where you need maximum focus. The monaural CS510 works well for users who take occasional calls and want to stay aware of their surroundings between conversations.
The headset provides an audible low-battery warning tone when approximately 15 minutes of talk time remains. This gives you enough notice to wrap up your current call and return the headset to the charging base.
The base station also has a visual indicator light that shows charging status. When the headset is properly seated and charging, you'll see a steady light. A full charge from empty takes about three hours.
Yes, the CS520 is hearing aid compatible and rated HAC (Hearing Aid Compatibility) by industry standards. The binaural design can be particularly helpful for hearing aid users because it delivers sound to both ears, working with bilateral hearing aids.
The adjustable volume controls let you set audio levels that work with your specific hearing aid configuration. Many users with hearing aids report clearer phone conversations using the CS520 compared to holding a handset against their hearing aid.
Yes, DECT 6.0 technology allows multiple headsets to operate in close proximity without interfering with each other. Each base station and headset pair on a unique channel automatically.
We have customers running 50+ CS520 systems in the same call center floor with no cross-talk or interference issues. The DECT standard is designed specifically for dense deployment environments where many wireless voice devices operate simultaneously.