Based on this product's specifications, here are some alternatives and similar models
Headset POLY Savi 8210 Monaural DECT 1880-1900 MHz Top +Charging Cradle
Summary description:
The POLY Savi 8210 Monaural headset features DECT technology operating in the 1880-1900 MHz range. It is designed for office and call center use, providing a frequency response of 20 to 20000 Hz. Weighing only 115 g, it offers comfort during extended use. The product comes with a charging cradle for easy recharging.