> ## Documentation Index > Fetch the complete documentation index at: https://docs.solidyne.ar/llms.txt > Use this file to discover all available pages before exploring further. # TELCO HL240 > 2-line hybrid + 2 Bluetooth interfaces HL240 Pn ## HL240-VQ Key Features ### Connectivity * **POTS telephone lines**: 2 analog hybrids with adjustable rejection. * **Bluetooth 4.0**: two independent channels with HSP / HFP / A2DP profiles. * **VoIP compatibility**: through ATA adapters or Bluetooth-enabled VoIP phones. * **Solidyne console interface**: direct hybrid send/return connection (2300, 2600, DX816/822, D612 series). ### Inputs and Outputs * **AUDIO IN (Send to Lines)**: unbalanced, for mix-minus feed from console. * **AUDIO OUT (Mix)**: balanced XLR output, delivers total line mix. * **PH-1 and BLT-1 direct outputs**: unbalanced, pre-fader, fixed level. * **Headphone output**: direct monitoring of main mix. ### Audio Processing * **VQR (Voice Quality Restoration)**: bass reconstruction down to 50 Hz and treble up to 12 kHz. * **NOISE Control**: noise gate to reduce background during conversation pauses. ### Operation * **Illuminated buttons**: line status and ring cadence. * **Built-in Talkback**: enables private conversation with caller. * **Priority system**: 10 dB attenuation of line audio when local voice is detected. * **Conference**: internal mixing of up to 4 lines (2 POTS + 2 Bluetooth). ### Performance * **Frequency response**: 50 Hz – 12 kHz with VQR // 300 Hz – 3.4 kHz without VQR. * **Signal-to-noise ratio**: 70 dBA with VQR. * **THD**: \< 0.2%. * **Hybrid rejection**: > 40 dB (measured with 2 km artificial line). ### Construction and Power * **19" rack format**: 1U height. Includes rubber feet for desktop use. * **Internal regulated power supply**: 110/220 V switchable, 20 W consumption. * **Surge protection**: metal oxide varistors withstanding up to 2,000 V.