Quick overview from the supplier:
Grandstream GRP2615, 5 SIP, 10 Lines, PoE, Wi-Fi, Black
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HD audio, handset and speakerphone with support for wide-band audio
10 line keys with up to 5 SIP accounts
40 built-in digital BLF keys; available extension module offers 40 BLF/speed dial keys per module
Enterprise-level protection including secure boot, dual firmware images, and encrypted data storage
integrated dual-band Wi-Fi 802.11 a/b/g/n/ac (2.4Ghz & 5Ghz)
Dual switched auto-sensing 10/100/1000 Mbps Gigabit Ethernet ports with integrated PoE
Swappable face plates to allow for easy logo customization
Integrated Bluetooth
https://www.grandstream.com/products/ip-voice-telephony/carrier-grade-ip-phones/grp-series-professional-ip-phones/product/grp2615