*The panel adopts buttons to control speaking mode and the number of speakers, breaking the traditional dial control.
*LCD screen displays working status
*The number of speakers: 1, 2,3,4,5,6 and full opening
*7 meeting work modes: ①chairman mode ②first in first out mode ③last in first out mode ④LIMIT mode ⑤FREE mode ⑥responder mode ⑦Apply speaking mode (just for BLS‐3505C/D unit)
*The host can connect 60 microphone units, it divide into 4 parallel outputs, each channel can connect 20 units. It also able to connect expansion unit number of extended machine up to 5000 units by power extended machine BLS‐350HD(under 255 units) or data extended machine BLS‐350HS(above 255 units).
*Equipped with audio parallel output and a 6.3 jack output, conference recording outputs and background music inputs interface.
*Built‐in telephone coupler input and output ports, and can be used for remote telephone conference. According to the principle of communication, it divide two‐way telephone voice signals into inputs and outputs. In order to control the intercom setting of phone call and set aside between the hall.

Frequency response: AC 220V±10% 50Hz
Rated voltage: 100Hz‐12.5Hz
Output impedance:
REC:200Ω LINE:200Ω
BALANCE: 300Ω
UNBALANCE: 400Ω
Input impedance: LINE:50KΩ PBIN:50KΩ
S /N Ratio: 100dB (1KHz THD1%)
Size:480*220*55mm
Weight:4KG