Quick overview from the supplier:
Grandstream WP810 Wi-Fi, 2 SIP, 2 Lines, Silver
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Dual-band Wi-Fi with efficient antenna design and advanced roaming support
2 SIP accounts, 2 lines
HD voice & dual MIC design with AEC and Noise Shield Technology
Rechargeable 1500mAh battery, 6 hour talk time, 120-hour standby
Configurable button for push-to-talk
Micro USB port and 3.5mm headset jack
https://www.grandstream.com/products/ip-voice-telephony/wifi-cordless/product/wp810
