Currently location trackers for valuables have a short battery life, demanding an intensive battery maintenance experience of the user. Discharged batteries mean a malfunctioning product, resulting in a false sense of security by the user. The incentive of this thesis is to explore the opportunities in energy harvesting technologies, low power electronics and the tracker market, and to consolidate these into a valuable design for a new tracker. With the usage patterns of different valuables as a basis, the power consumption and yield of different applications and configurations are calculated, creating an overview of the feasibility of application fields for trackers. The suitability for low intensity location sharing, the availability of light and moving parts, the high theft rates and the possibility for off-grid storage make bicycles suitable for trackers powered by energy harvested from the environment. Around 400.000 bicycles are stolen in the Netherlands annually, resulting in an acceptance of the inconvenience that disempowers the victims in the event of a theft. Victims show a clear need for acting on theft by consulting their social network. Victims have lost their faith in the solving capability of the police, hence victims without a bicycle insurance plan tend not to register their bicycle as stolen. For the police department, registering stolen bicycles serves as the driving force for acting on bicycle theft. The police has a clear need for more (accurate) data on bicycle theft. The interview with the police underlines the necessity of the police for a legal retrieving procedure. With the outcomes of desk research, interviews, experiments, field tests, and context mapping session throughout the analysis phase, the following assignment is formulated: ∙∙ To design a compatible and affordable bicycle tracker, which is independent from a finite power source and helps, empowers and guides victims to legally track and retrieve their stolen their stolen bicycles, resulting in a reduction of theft rates. The iterative design approach in the synthesis phase revealed the most appropriate implementation of the tracker. Limiting the update moments to just before and after a ride, and using power down states interrupted by a mechanical tilt switch showed huge power reductions, revealing the opportunity of a solely battery powered tracker with a battery life of more than 10 years. With this finding the usage of energy harvesters becomes unnecessary. The dependency of energy harvesters on the energy from the environment makes them rather unreliable, incompatible with different bicycles and vulnerable for tampering. For the purpose of a bicycle tracker that acts on theft, a batterypowered product is a better solution. The battery-powered product is integrated into the seat post tube of the bicycle; this position is the most favourable considering the performance of the data communication, the compatibility and the tamper resistance. Tests with the LoRa network show reliable results of the KPN network for implementing it in a tracker. This low power, low costs communication network supports location tracking starting from the beginning of 2017. The final result is a maintenance free, affordable and hardly distinguishable tracker that is compatible with most bicycles. During the activation of the product the user constructs a ‘bicycle passport’, capturing the identity. In the event of a theft, the location is updated and can be shared with the police and social media, enabling a more efficient retrieving procedure.