Poly M40S alternatives, similar headphones

Motorola HS830 Hands-Free Pendant
Specifications

Logitech EasyFit Earbud Headset
Specifications

Conceptronic Soundstar CSOUNDSTAR
Specifications

Conceptronic Gamestar USB CGAMESTARU
Specifications

Saitek A-300
Specifications

Logitech Mobile Traveller Headset SE
Specifications

Poly - Plantronics MX 500
Specifications

Sennheiser Set 810
Specifications

Sennheiser HD 205
Specifications

Sennheiser PMX 100
Specifications

Sennheiser PMX 200
Specifications

Sennheiser PC 30
Specifications

Poly Voyager 510S
Specifications

Poly Voyager 510SL
Specifications

Poly SupraPlus
Specifications

Poly Voyager 510SL Plus
Specifications

Poly Voyager 510
Specifications

Poly CS 60M with HL10 handset lifter
Specifications

Poly Voyager 510 + HL10 Lifter
Specifications

Poly Voyager 510 + HL10 Lifter + Travel Pack
Specifications

Poly CS 55
Specifications

Poly SupraPlus H251/A Voice Tube
Specifications

Poly SupraPlus H251N/A
Specifications

Poly CS 70 with HL10 handset lifter
Specifications