This is the MyLaps Personal RC4 Hybrid Direct Powered Transponder.

Features:
- Half the size, half the weight of the original
- Low voltage operation: 2.8-16 Volt compatible
- Transponder and transponder holder are individual parts, so you can easily switch transponders between different cars (extra holders sold separately).
- Better quality cable (PTFE) that is fuel resistant
- 1-4 cell LiPo compatible

Fully hybrid:
- 100% compatible with RC2/RC3 Timing Systems (previously AMBrc)
- 100% compatible with RC4, and ready for the future

Specifications:
- Dimensions (excluding holder) (WxLxH): 16x19x6mm
- Weight: 4.7g (including holder)
- Operating voltage: 2.8 - 16.0 V
- Power consumption*: 19 mA
- Wire isolation**: PTFE
- Quick change holder: Yes
- Connector: Generic receiver 3-pole

*Measured at 6.0 volt (receiver output)
**Gasoline/Nitro-methane resistant, no aging