S1/S1 LF Business Two-way Radio

S1/S1 LF

Handheld | Analogue

Hytera S1/S1 LF redefines the business-ready analog radio. It blends classic radio elements with exquisite craftsmanship and forward fashion. From form factor to user experience, the S1/S1 LF breaks with tradition to shape the trend of next-generation business radio—modern, simple, and timeless.

Highlights of S1/S1 LF

PTT Unlike Any Other

Another PTT in the front—enlarged size, circle shape, and phonograph-record-like texture.

Airy-light Design

135 g in weight. All for one-hand operation on the go.

Light for U

Four LEDs tell you the radio status in their own way.

Dual PTT

Talk with either of two standby groups—not just one as before.

Talk Freely

Cover 3-5 floors and 3-5 km in urban areas; meet the indoor communication needs of more than 10,000 square meters.

Outlast Your Shift

With a battery life of up to 27 hours (0.5W) or 15 hours (3W) of working time and 360 hours of standby time, your focus remains on the job, not the clock.

Channel Copy

Quickly communicate with your existing radios, regardless of brands and models.


You can clone configuration data from one S1 to many. All done in a flash.

Hytera Radio APP

Manage your radio with a phone, at your fingertips. Perform BT-enabled programming, batch configuration, frequency information backup, and then some.

Specifications of S1/S1 LF

Model HYT-S31/HYT-S31 LF
Frequency Range 400-470 MHz (Main Unit) /446 MHz
Channel Capacity 48
Zone Capacity 3
Channel Spacing 12.5kHz/20kHz/25kHz
Operating Voltage 3.8V (Rated)
Battery 2200mAh Li-Polymer
Battery Life (5/5/90 Duty Cycle, TX Power) 15 hrs (3W) /22 hrs (1W) /27 hrs (0.5W)
Frequency Stability ±2ppm
Antenna Impedance 50 Ω
Dimensions (HxWxD) 108*53*20mm (Without antenna)
Weight (With battery and antenna) 145 g (With belt clip) 135 g (Without belt clip)
BT BLE (only data) 5.0
Sensitivity 0.14μV
Adjacent Channel Selectivity ETSI: 60dB@12.5kHz / 70dB@20/25kHz
Intermodulation ETSI: 65dB@12.5/20/25kHz
Spurious Response Rejection ETSI: 70dB@12.5/20/25kHz
Blocking ETSI:84dB
Hum&Noise 40dB@12.5kHz; 43dB@20kHz; 45dB@25kHz
Rated Audio Power Output 0.5W
Rated Audio Distortion ≤5%
Audio Response +1~-3 dB
Conducted Spurious Emission <-57 dBm
Power Output 400-470 MHz: 1W / 3W (low/high) 446 MHz: 0.5W
FM Modulation 11K0F3E@12.5kHz 14K0F3E@20kHz 16K0F3E@25kHz
Conducted/Radiated Emission -36dBm<1GHz -30dBm>1GHz
Modulation Limiting ±2.5 kHz@12.5 kHz; ±4.0 kHz@20 kHz; ±5.0 kHz@25 kHz
FM Hum&Noise 40 dB@12.5 kHz; 43 dB@20 kHz; 45 dB@25 kHz
Adjacent Channel Power 60 dB@12.5 kHz; 70 dB@20/25 kHz
Audio Distortion ≤3%
Operating Temperature -10℃ ~ +55℃
Storage Temperature -30℃ ~ +70℃
ESD ±4kV (Contact) ±8kV (Air)
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