The TS-691L is a Chairman unit in the TOA TS-690 Series conference system, known for its compact and lightweight design, which makes it easy to install and store. The speech button controls the microphone and speaker functions. When the speech button is in the ON position, the chairman can speak while disabling the speaker to prevent feedback. When the speech button is in the OFF position, the microphone is disabled, but the speaker is turned on to allow monitoring of voices from delegate units (TS-692L). Pressing the priority key on the chairman unit allows the chairman to take precedence over delegate units.

### Specifications:
– Power Source: 36 V DC, 30 mA or less (supplied from the Central Unit TS-690)
– Output:
– Headphone/Recording: Ø 3.5 mm, mini jack (3P: monaural)
– Internal speaker: 130 Ω, 200 mW
– Control:
– Speech: Microphone, speaker on-off control by speech button
– Priority: Microphone, speaker on-off, other microphone cut-off, and single-tone chime activation by priority button
– Volume control: Headphone/Recording and internal speaker volume adjustable
– Microphone Unit (Accessory):
– Type: Electret Condenser Microphone
– Directivity: Unidirectional
– Impedance: 1.8kΩ
– Sensitivity: -37dB (1kHz 0dB = 1V/Pa)
– Frequency Response: 100Hz – 13 kHz
– Length: 518mm
– Weight: 105g (0.23 lb)
– Operating Temperature: 0 °C to +40 °C (32 °F to 104 °F)
– Operating Humidity: 90 %RH or less (no condensation)

### Design:
– Upper case: ABS resin, metallic grey, paint
– Lower case: ABS resin, black

### Dimensions:
– 145.3 (W) × 70.7 (H) × 150.5 (D) mm (5.72″ × 2.78″ × 5.93″) (Excluding Microphone Unit)

### Weight:
– 800 g (1.76 lb) (Excluding Microphone Unit)

### Accessories:
– Long Microphone Unit x 1

### Options:
– Extension cords: YR-790-3, YR-790-10