For small children, this configuration is ideal because only the tiny, ultralight control unit is worn on the ear. The attached battery pack provides additional security, especially during playtime. Up to 90 hours of use with a set of 3 high-power zinc-air batteries Wireless access with integrated telecoil BabyBTE/ActiveWear For infants & small children or individuals participating in high-energy activities. The entire processor, including batteries, is attached to clothing so that it remains securely in place. Up to 90 hours of use with a set of 3 high-power zinc-air batteries Wireless access with integrated telecoil