Thông số kỹ thuật: Power Source 35 V DC, under 30 mA (supplied from Central Unit) Output Headphone/Recording: 32 Ω (headphone)/10 kΩ, -20 dB* (recording), unbalanced, mini jack (with VR) Internal speaker: 130 Ω, 200 mW Contact output: 24 V DC, max. 50 mA Control Speech button: Microphone, speaker on-off control by speech switch Priority button: Microphone, speaker on-off, other microphone cutoff, and single-tone chime activation Operating Temperature 0℃ to +40℃ (32゜F to 104゜F) Operating Humidity Under 90% RH (no condensation) Finish Case: ABS resin, black Panel: ABS resin, gray metallic, semi-gloss, paint Dimensions 114.5 (W) × 78.4 (H) × 152.9 (D) mm (4.51" × 3.09" × 6.02") Weight 780 g (1.72 lb) Option Microphone: TS-773 (standard), TS-774 (long) (select either one)