The model WP04 Wi-Fi phone is a smart type design that supports 802.11b/g, SIP, G.711a/u-law, G.729a/b, UDP, RTP, DHCP and TFTP etc. 802.11b/g, IEEE 802.1x, 802.11i WEP (64, 128 bit encryption)/ WPA /WPA2 /MD5 Auth Direct IP call without SIP registration Up to 4 SIP profiles possible Dial registered number via SIP server Dial URL from phone book / speed dial Three-way calling / Call waiting Call reject/ Redial/ Mute Caller ID /Anonymous call Message waiting indicator 5 way navigation paddle Keyboard backlight Vibrator switch Key lock Hands free Volume control Phonebook/ call logs Codec G.711, G.729a/b Comfort noise generation (CNG) Voice activity detection (VAD) Acoustic Echo Cancellation (AEC) Net Search Auto Scan TFTP Provisioning STUN support Charging via USB on PC or adapter possible. Very low power (longest standby/talk time) Light and small: Breast pocket design Packaging information: Earphone, USB cable, Adapter Phone dimension: 105 * 47 * 15mm Color box dimension: 150 * 130 * 45mm Weight: about 100g