HP Poly Edge E400 Desktop Business IP Phone dual lens camera and copying in home office GH388HILXXBKMY and copying in home office and small business environments 3 kHz Talk Time Up to 13 hours Standby Time Up to 52 hours Charging Time Approximately 90 minutes Charging Method Charging Stand and USB C Charging Battery Type Rechargeable Lithium Ion User Replaceable Battery Yes Ear Cushion Material Leatherette Encryption FIPS Military Grade 256 Bit Encryption Hearing Protection SafeTone 2 The HP Poly Edge E400 is an Open SIP business IP desk phone engineered around dual displays to optimize call monitoring and workflow efficiency and a bass frequency enhancing speaker design to maintain speech clarity across all communication channels