中国香港采购需求：运动监测臂带、健身追踪器心率监测器、腕式智能心率监测器、臂带式心率监测器、心率监测器

I am a physical education teacher located in Guangzhou and am currently looking to equip my class with heart rate monitors suitable for a group of 20 to 25 students. I want a model that is user-friendly and can provide accurate readings during various physical activities. The monitors should ideally be durable, comfortable to wear, and able to withstand the rigors of active use by students. Additionally, it would be great if the monitors have features like Bluetooth connectivity for easy data tracking, and perhaps a companion app for both students and teachers to monitor progress. I would appreciate your recommendations on models that meet these criteria. Please also include information about pricing, availability, and any bulk purchase discounts you may offer.