# VivAct™ Technical Datasheet

> **Device:** VivAct™ Precision Rodent Running-Wheel Telemetry System  
> **Manufacturer:** S2P d.o.o. (Science to Practice), Slovenia (European Union)  
> **Standard:** Laboratory Research Instrumentation / Preclinical Rodent Telemetry  
> **Document Code:** DS-VIVACT-2026-V12

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## 1. Physical & Mechanical Dimensions

| Parameter | Value | Engineering Notes |
|---|---|---|
| **Outer Dimensions (W × D × H)** | 148 × 146 × 86 mm | Fits standard cage layouts; verified for Tecniplast GM500 |
| **Minimum Required Cage Height** | 140 mm internal clearance | Preserves airflow under IVC supply nozzles |
| **Wheel Diameter** | 135 mm | Validated biomechanics for adult mice (20–35 g) |
| **Effective Circumference** | 0.4084 m (408.4 mm) | Based on effective running centerline radius |
| **Running Track Width** | 56 mm | Open crossbar design |
| **Rung Spacing** | 9 mm | Laser-welded Inox; prevents paw and tail pinch |
| **Rotor Mass (Rotating Element)** | 150 g | Rigid monolithic stainless steel with low breakaway torque |
| **Total Unit Mass** | 520 g | Heavy base with elastomer feet eliminates bedding drift |
| **Footprint in Tecniplast GM500** | 105.8 cm² (~21% of 500.7 cm²) | Leaves ~79% free cage floor for nesting and bedding |

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## 2. Bearing, Tribology & Sensor Architecture

| Parameter | Specification |
|---|---|
| **Bearing System** | Dry sliding friction pair (Precision-machined brass sleeve + PTFE ring) |
| **Lubrication Requirement** | 100% dry; zero grease or oil required |
| **Contaminant Resistance** | Completely immune to woodchip dust, corncob bedding, and urine/ammonia |
| **Acoustic Signature** | < 28 dBA (virtually silent during nocturnal sprint bouts) |
| **Rotation Sensor Type** | Hermetically sealed contactless magnetic sensor |
| **Enclosure Sealing** | Solid polymer potting; water- and urine-resistant |

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## 3. Electrical, Power & Connectivity

| Parameter | Specification |
|---|---|
| **Battery Chemistry** | High-density lithium rechargeable cell |
| **Autonomy Profile** | Multi-month continuous logging (<20% capacity drop per 30 days) |
| **Charging Interface** | Standard 5V USB Type-C |
| **Port Environmental Protection** | Waterproof cap with rubber sealing gasket |
| **Wireless Protocol** | Wi-Fi 4 (IEEE 802.11 b/g/n, 2.4 GHz) |
| **Network Security** | WPA2-Personal (PSK); dedicated isolated IoT VLAN recommended |
| **RF Duty Cycle** | Transmitter active < 10 seconds per 24 hours (scheduled batch sync) |
| **Data Buffering** | Internal non-volatile Flash memory; survives network drops |

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## 4. Telemetry Metrics & Export Format

Exported format: Clean unencrypted CSV (`vivact_data.csv`)

| Metric / Column | Unit | Description |
|---|---|---|
| `Series_Start` | Timestamp | Start timestamp of bout (millisecond precision) |
| `Duration_ms` | ms | Continuous duration of running bout |
| `Distance_m` | m | Accumulated linear distance (`Pulses × 0.4084`) |
| `Min_Period_ms` | ms | Minimum period between adjacent pulses |
| `Max_Speed_m_min` | m/min | Peak instantaneous velocity (`0.4084 / (Min_Period / 60000)`) |
| `Avg_Speed_m_min` | m/min | Average bout velocity (`Distance / (Duration / 60000)`) |
| `Day_Night` | 0 / 1 | Photoperiod indicator (0 = Light, 1 = Dark) |
| `Battery` | Volts / % | Battery status indicator |

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## 5. Sanitation SOP Summary

1. **Cap Inspection:** Verify the USB Type-C protective cap with rubber sealing gasket is securely closed.
2. **Surface Decontamination:** Wipe down or briefly rinse with 70% alcohol (ethanol / isopropanol) or quaternary ammonium compounds (QAC). Do not submerge for prolonged soaking.
3. **UV-C Exposure & Drying:** Air-dry and expose to UV-C lamp in a biosafety laminar flow hood according to standard facility SOP.
4. **WARNING:** **AUTOCLAVING IS STRICTLY PROHIBITED.**

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## 6. Manufacturer & Contact
- **Company:** S2P d.o.o. (Science to Practice)
- **Country:** Slovenia, European Union
- **Website:** https://www.s2p.si
- **Direct Contact:** Petr Timofeyev <petr.timofeyev@s2p.si> • info@s2p.si