Plantronics - CS540 8J8V4AA#ABB Convertible Wireless DECT Headset - 21g, 7Hr Talk, 350ft Range, Noise-Cancel Mic, Desk Phone, DECT 6.0 - Black

The Poly CS540 (8J8V4AA#ABB) is a convertible DECT 6.0 wireless headset designed for desk phone communication in office and contact center environments. Weighing just 21 grams, it features an ultralight convertible design for all-day wear. The CS540 delivers up to 350 feet of wireless range using DECT 6.0 technology, freeing professionals to move throughout the workplace while staying connected. Its noise-canceling microphone reduces background noise for clear, professional audio, while advanced wideband audio technology and DSP deliver high-quality voice on every call. The headset features SoundGuard hearing protection that guards against sudden audio spikes above 118 dBA. A replaceable battery provides up to 7 hours of talk time and recharges in approximately 3 hours. The CS540 includes three wearing styles: over-the-ear with earloop, headband monaural, and optional neckband. Conference up to 4 headsets on a single base for training and collaboration. Compatible with most corded desk phones via the included RJ9 telephone interface cable. Optional EHS cable or HL10 handset lifter sold separately for remote call answer.

• Ultralight DECT 6.0 Wireless — 350 ft Range: The CS540 uses DECT 6.0 technology to deliver interference-free wireless audio up to 350 feet (100 m) from the charging base. Unlike Bluetooth, DECT 6.0 operates on a dedicated frequency band that does not compete with Wi-Fi, significantly reducing the risk of dropped calls and audio interference. The energy-efficient adaptive power system automatically adjusts output to optimize range and talk time based on distance from the base.
• 21g Featherweight Design — 3 Wearing Styles: At just 21 grams (0.74 oz), the CS540 is one of the lightest commercial DECT headsets available, built for professionals who need hands-free communication all day without fatigue. Choose from three wearing configurations: over-the-ear earloop (includes S/M/L ear gels), monaural headband, or optional behind-the-neck band (sold separately). Switch between styles to find your perfect all-day fit.
• Noise-Canceling Mic + SoundGuard Hearing Protection: A professional-grade noise-canceling microphone reduces background ambient noise, ensuring callers hear you clearly in busy open-plan offices and contact centers. SoundGuard technology monitors and caps audio output above 118 dBA to protect your hearing from sudden loud sounds. Anti-Startle technology detects and reduces large, sudden increases in signal level before they reach your ear.
• 7-Hour Talk Time | Conference Up to 4 Headsets: The CS540 provides up to 7 hours of continuous talk time on a single replaceable battery charge, with a full recharge in approximately 3 hours. The conference feature allows up to 3 additional CS500-series headsets to join a single base, making it ideal for supervisor monitoring, training, and collaborative call handling. One-touch call answer/end, volume +/-, mute, and flash controls are built directly into the headset.
• Works With Most Desk Phones | Easy Setup: Connects to most corded desk phones via the included RJ9 telephone interface cable — no software or drivers required. The base station compatibility slide switch (positions A–G) covers a wide range of desk phone models from Avaya, Cisco, Polycom, Yealink, and more. For remote call answer and hang-up from up to 350 feet away, add an optional EHS Electronic Hook Switch cable or HL10 handset lifter (sold separately, phone-specific).