I fitted the Gemini Power Plus alarm in only 1 hour. Once fitted it was easy to adjust the sensitivity, but this had to be done before replacing the bodywork, as it's a small screw on the alarm unit. It has been faultless in operation, and has not given any problems since it's been on. It has now been on my scooter for 2 and a half years, and I can recommend it to anyone as a good value for money purchase. Costing only £85.00, it was cheaper than most, and Italian made.