Yealink

Yealink RT30. Frequency range (EU): 1880 - 1900 MHz, Frequency range (US): 1920 - 1930 MHz, RF power: 10 mW. AC input voltage: 100 - 240 V, DC output voltage: 5 V, DC output current: 0.6 A. Width: 5.12" (130 mm), Depth: 0.988" (25.1 mm), Height: 3.94" (100 mm)

Yealink SIP-T42S. Product type: IP Phone, Product color: Black, Handset type: Wired handset. Dual-Tone Multi-Frequency (DTMF) modes: In-band, Out-of band, SIP info. Lines quantity: 12 lines, Phonebook capacity: 1000 entries. Volume control: Digital. Display: LCD, Display diagonal: 2.7", Display resolution: 192 x 64 pixels

Yealink BT50. Product color: Black, Bluetooth profiles: A2DP, DIP, HFP, Wireless range: 1181.1" (30 m). Connectivity technology: Wireless, Device interface: USB. Power source type: USB. Width: 0.547" (13.9 mm), Depth: 0.709" (18 mm), Height: 0.201" (5.1 mm)